![thumbnail map](https://webarchive.library.unt.edu/web/20090110143424im_/http://walrus.wr.usgs.gov/infobank/n/n199sm/html/n-1-99-sm.nav.150px.jpg)
99001
(N-1-99-SM)
01/10/99 - 02/01/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090110143424im_/http://walrus.wr.usgs.gov/infobank/g/g199gm/html/g-1-99-gm.nav.150px.jpg)
99002
(G-1-99-GM)
04/09/99 - 04/21/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090110143424im_/http://walrus.wr.usgs.gov/infobank/o/o399gk/html/o-3-99-gk.nav.150px.jpg)
99003
(O-3-99-GK)
03/17/99 - 03/25/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090110143424im_/http://walrus.wr.usgs.gov/infobank/l/l499gk/html/l-4-99-gk.nav.150px.jpg)
99004
(L-4-99-GK)
06/14/99 - 06/23/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090110143424im_/http://walrus.wr.usgs.gov/infobank/o/o599gk/html/o-5-99-gk.nav.150px.jpg)
99005
(O-5-99-GK)
08/25/99 - 08/31/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090110143424im_/http://walrus.wr.usgs.gov/infobank/o/o699nb/html/o-6-99-nb.nav.150px.jpg)
99006
(O-6-99-NB)
12/03/99 - 12/07/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090110143424im_/http://walrus.wr.usgs.gov/infobank/h/h799my/html/h-7-99-my.nav.150px.jpg)
99007
(H-7-99-MY)
02/10/99 - 02/11/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090110143424im_/http://walrus.wr.usgs.gov/infobank/h/h899my/html/h-8-99-my.nav.150px.jpg)
99008
(H-8-99-MY)
05/11/99 - 05/12/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090110143424im_/http://walrus.wr.usgs.gov/infobank/h/h999my/html/h-9-99-my.nav.150px.jpg)
99009
(H-9-99-MY)
09/21/99 - 09/22/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090110143424im_/http://walrus.wr.usgs.gov/infobank/s/s1099sc/html/s-10-99-sc.nav.150px.jpg)
99010
(S-10-99-SC)
04/01/99 - 04/03/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090110143424im_/http://walrus.wr.usgs.gov/infobank/d/d1199st/html/d-11-99-st.nav.150px.jpg)
99011
(D-11-99-ST)
03/18/99 - 03/26/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090110143424im_/http://walrus.wr.usgs.gov/infobank/c/c1299gk/html/c-12-99-gk.nav.150px.jpg)
99012
(C-12-99-GK)
06/18/99 - 06/25/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090110143424im_/http://walrus.wr.usgs.gov/infobank/m/m1499gc/html/m-14-99-gc.nav.150px.jpg)
99014
(M-14-99-GC)
05/12/99 - 05/26/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090110143424im_/http://walrus.wr.usgs.gov/infobank/s/s1599cd/html/s-15-99-cd.nav.150px.jpg)
99015
(S-15-99-CD)
03/12/99 - 03/12/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090110143424im_/http://walrus.wr.usgs.gov/infobank/s/s1699cd/html/s-16-99-cd.nav.150px.jpg)
99016
(S-16-99-CD)
03/25/99 - 03/25/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090110143424im_/http://walrus.wr.usgs.gov/infobank/s/s1799cd/html/s-17-99-cd.nav.150px.jpg)
99017
(S-17-99-CD)
04/08/99 - 04/08/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090110143424im_/http://walrus.wr.usgs.gov/infobank/s/s1899cd/html/s-18-99-cd.nav.150px.jpg)
99018
(S-18-99-CD)
04/26/99 - 04/26/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090110143424im_/http://walrus.wr.usgs.gov/infobank/s/s1999cd/html/s-19-99-cd.nav.150px.jpg)
99019
(S-19-99-CD)
05/10/99 - 05/10/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090110143424im_/http://walrus.wr.usgs.gov/infobank/s/s2099cd/html/s-20-99-cd.nav.150px.jpg)
99020
(S-20-99-CD)
05/24/99 - 05/24/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090110143424im_/http://walrus.wr.usgs.gov/infobank/a/a2199my/html/a-21-99-my.nav.150px.jpg)
99021
(A-21-99-MY)
03/26/99 - 03/26/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090110143424im_/http://walrus.wr.usgs.gov/infobank/h/h2299ps/html/h-22-99-ps.nav.150px.jpg)
99022
(H-22-99-PS)
09/15/99 - 09/23/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090110143424im_/http://walrus.wr.usgs.gov/infobank/m/m2399li/html/m-23-99-li.nav.150px.jpg)
99023
(M-23-99-LI)
07/26/99 - 08/06/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090110143424im_/http://walrus.wr.usgs.gov/infobank/i/i2499st/html/i-24-99-st.nav.150px.jpg)
99024
(I-24-99-ST)
07/13/99 - 07/30/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090110143424im_/http://walrus.wr.usgs.gov/infobank/p/p2599hw/html/p-25-99-hw.nav.150px.jpg)
prwl99025
(P-25-99-HW)
04/14/99 - 04/14/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090110143424im_/http://walrus.wr.usgs.gov/infobank/m/m2699mc/html/m-26-99-mc.nav.150px.jpg)
99026
(M-26-99-MC)
06/19/99 - 06/29/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090110143424im_/http://walrus.wr.usgs.gov/infobank/a/a2799ma/html/a-27-99-ma.nav.150px.jpg)
99027
(A-27-99-MA)
04/13/99 - 04/13/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090110143424im_/http://walrus.wr.usgs.gov/infobank/s/s2899sc/html/s-28-99-sc.nav.150px.jpg)
99028
(S-28-99-SC)
06/10/99 - 07/07/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090110143424im_/http://walrus.wr.usgs.gov/infobank/s/s2999cd/html/s-29-99-cd.nav.150px.jpg)
99029
(S-29-99-CD)
01/12/99 - 01/12/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090110143424im_/http://walrus.wr.usgs.gov/infobank/s/s3099cd/html/s-30-99-cd.nav.150px.jpg)
99030
(S-30-99-CD)
01/25/99 - 01/25/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090110143424im_/http://walrus.wr.usgs.gov/infobank/s/s3199cd/html/s-31-99-cd.nav.150px.jpg)
99031
(S-31-99-CD)
02/10/99 - 02/10/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090110143424im_/http://walrus.wr.usgs.gov/infobank/s/s3299cd/html/s-32-99-cd.nav.150px.jpg)
99032
(S-32-99-CD)
02/19/99 - 03/03/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090110143424im_/http://walrus.wr.usgs.gov/infobank/a/a3399gk/html/a-33-99-gk.nav.150px.jpg)
99033
(A-33-99-GK)
06/02/99 - 06/10/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090110143424im_/http://walrus.wr.usgs.gov/infobank/s/s3499cd/html/s-34-99-cd.nav.150px.jpg)
99034
(S-34-99-CD)
06/17/99 - 06/17/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090110143424im_/http://walrus.wr.usgs.gov/infobank/s/s3599cd/html/s-35-99-cd.nav.150px.jpg)
99035
(S-35-99-CD)
07/15/99 - 07/15/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090110143424im_/http://walrus.wr.usgs.gov/infobank/s/s3699cd/html/s-36-99-cd.nav.150px.jpg)
99036
(S-36-99-CD)
08/13/99 - 08/13/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090110143424im_/http://walrus.wr.usgs.gov/infobank/s/s3799cd/html/s-37-99-cd.nav.150px.jpg)
99037
(S-37-99-CD)
08/26/99 - 08/26/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090110143424im_/http://walrus.wr.usgs.gov/infobank/s/s3899cd/html/s-38-99-cd.nav.150px.jpg)
99038
(S-38-99-CD)
09/16/99 - 09/17/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090110143424im_/http://walrus.wr.usgs.gov/infobank/s/s3999cd/html/s-39-99-cd.nav.150px.jpg)
99039
(S-39-99-CD)
09/30/99 - 09/30/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090110143424im_/http://walrus.wr.usgs.gov/infobank/a/a4099my/html/a-40-99-my.nav.150px.jpg)
99040
(A-40-99-MY)
05/26/99 - 05/26/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090110143424im_/http://walrus.wr.usgs.gov/infobank/a/a4199ma/html/a-41-99-ma.nav.150px.jpg)
99041
(A-41-99-MA)
07/07/99 - 07/09/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090110143424im_/http://walrus.wr.usgs.gov/infobank/a/a4299cd/html/a-42-99-cd.nav.150px.jpg)
99042
(A-42-99-CD)
06/14/99 - 06/17/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090110143424im_/http://walrus.wr.usgs.gov/infobank/a/a4399cd/html/a-43-99-cd.nav.150px.jpg)
99043
(A-43-99-CD)
06/29/99 - 07/01/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090110143424im_/http://walrus.wr.usgs.gov/infobank/s/s4499sr/html/s-44-99-sr.nav.150px.jpg)
99044
(S-44-99-SR)
10/29/99 - 11/12/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090110143424im_/http://walrus.wr.usgs.gov/infobank/s/s4599nr/html/s-45-99-nr.nav.150px.jpg)
99045
(S-45-99-NR)
10/07/99 - 10/27/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090110143424im_/http://walrus.wr.usgs.gov/infobank/s/s4699sc/html/s-46-99-sc.nav.150px.jpg)
99046
(S-46-99-SC)
10/11/99 - 10/15/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090110143424im_/http://walrus.wr.usgs.gov/infobank/s/s4799sc/html/s-47-99-sc.nav.150px.jpg)
99047
(S-47-99-SC)
11/16/99 - 11/16/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090110143424im_/http://walrus.wr.usgs.gov/infobank/d/d4899me/html/d-48-99-me.nav.150px.jpg)
99048
(D-48-99-ME)
08/30/99 - 09/02/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090110143424im_/http://walrus.wr.usgs.gov/infobank/s/s4999cd/html/s-49-99-cd.nav.150px.jpg)
99049
(S-49-99-CD)
09/07/99 - 09/07/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090110143424im_/http://walrus.wr.usgs.gov/infobank/s/s5099cd/html/s-50-99-cd.nav.150px.jpg)
99050
(S-50-99-CD)
10/19/99 - 10/19/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090110143424im_/http://walrus.wr.usgs.gov/infobank/s/s5199cd/html/s-51-99-cd.nav.150px.jpg)
99051
(S-51-99-CD)
10/29/99 - 10/29/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090110143424im_/http://walrus.wr.usgs.gov/infobank/s/s5299cd/html/s-52-99-cd.nav.150px.jpg)
99052
(S-52-99-CD)
11/15/99 - 11/15/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090110143424im_/http://walrus.wr.usgs.gov/infobank/s/s5399nr/html/s-53-99-nr.nav.150px.jpg)
99053
(S-53-99-NR)
10/02/99 - 10/07/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090110143424im_/http://walrus.wr.usgs.gov/infobank/s/s5499ny/html/s-54-99-ny.nav.150px.jpg)
99054
(S-54-99-NY)
11/17/99 - 11/18/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090110143424im_/http://walrus.wr.usgs.gov/infobank/c/c5699li/html/c-56-99-li.nav.150px.jpg)
99056
(C-56-99-LI)
11/08/99 - 11/11/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090110143424im_/http://walrus.wr.usgs.gov/infobank/s/s5799nr/html/s-57-99-nr.nav.150px.jpg)
99057
(S-57-99-NR)
11/07/99 - 11/12/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090110143424im_/http://walrus.wr.usgs.gov/infobank/s/s5899cd/html/s-58-99-cd.nav.150px.jpg)
99058
(S-58-99-CD)
11/30/99 - 11/30/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090110143424im_/http://walrus.wr.usgs.gov/infobank/s/s6099cd/html/s-60-99-cd.nav.150px.jpg)
99060
(S-60-99-CD)
12/30/99 - 12/30/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090110143424im_/http://walrus.wr.usgs.gov/infobank/s/s6199nr/html/s-61-99-nr.nav.150px.jpg)
99061
(S-61-99-NR)
12/05/99 - 12/10/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090110143424im_/http://walrus.wr.usgs.gov/infobank/a/a6299ma/html/a-62-99-ma.nav.150px.jpg)
99062
(A-62-99-MA)
10/15/99 - 10/15/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090110143424im_/http://walrus.wr.usgs.gov/infobank/a/a6399ma/html/a-63-99-ma.nav.150px.jpg)
99063
(A-63-99-MA)
11/18/99 - 11/18/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090110143424im_/http://walrus.wr.usgs.gov/infobank/s/s6699cd/html/s-66-99-cd.nav.150px.jpg)
99066
(S-66-99-CD)
12/20/99 - 12/20/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090110143424im_/http://walrus.wr.usgs.gov/infobank/g/g399sr/html/g-3-99-sr.nav.150px.jpg)
990fa01
(G-3-99-SR)
05/23/99 - 05/29/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090110143424im_/http://walrus.wr.usgs.gov/infobank/g/g399fl/html/g-3-99-fl.nav.150px.jpg)
99asr01
(G-3-99-FL)
06/29/99 - 06/30/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090110143424im_/http://walrus.wr.usgs.gov/infobank/h/h199or/html/h-1-99-or.nav.150px.jpg)
99cca01
(H-1-99-OR)
05/24/99 - 05/25/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090110143424im_/http://walrus.wr.usgs.gov/infobank/a/a499ec/html/a-4-99-ec.nav.150px.jpg)
99cch04
(A-4-99-EC)
01/01/99 - 01/01/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090110143424im_/http://walrus.wr.usgs.gov/infobank/h/h599fl/html/h-5-99-fl.nav.150px.jpg)
99cch05
(H-5-99-FL)
01/01/99 - 01/01/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090110143424im_/http://walrus.wr.usgs.gov/infobank/g/g199fl/html/g-1-99-fl.nav.150px.jpg)
99lca01
(G-1-99-FL)
04/27/99 - 04/28/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090110143424im_/http://walrus.wr.usgs.gov/infobank/g/g299fl/html/g-2-99-fl.nav.150px.jpg)
99lca02
(G-2-99-FL)
05/04/99 - 05/04/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090110143424im_/http://walrus.wr.usgs.gov/infobank/g/g199sr/html/g-1-99-sr.nav.150px.jpg)
99sce01
(G-1-99-SR)
06/08/99 - 06/16/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090110143424im_/http://walrus.wr.usgs.gov/infobank/g/g299sr/html/g-2-99-sr.nav.150px.jpg)
99sce02
(G-2-99-SR)
06/17/99 - 06/22/99
|