![thumbnail map](https://webarchive.library.unt.edu/web/20090510215150im_/http://walrus.wr.usgs.gov/infobank/a/a399ec/html/a-3-99-ec.nav.150px.jpg)
a-3-99-ec
09/08/99 - 09/08/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090510215150im_/http://walrus.wr.usgs.gov/infobank/s/s199mb/html/s-1-99-mb.nav.150px.jpg)
s-1-99-mb
10/05/99 - 10/08/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090510215150im_/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/20090510215150im_/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/20090510215150im_/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/20090510215150im_/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/20090510215150im_/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/20090510215150im_/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/20090510215150im_/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/20090510215150im_/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/20090510215150im_/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/20090510215150im_/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/20090510215150im_/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/20090510215150im_/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/20090510215150im_/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/20090510215150im_/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/20090510215150im_/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/20090510215150im_/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/20090510215150im_/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/20090510215150im_/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/20090510215150im_/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/20090510215150im_/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/20090510215150im_/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/20090510215150im_/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/20090510215150im_/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/20090510215150im_/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/20090510215150im_/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/20090510215150im_/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/20090510215150im_/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/20090510215150im_/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/20090510215150im_/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/20090510215150im_/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/20090510215150im_/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/20090510215150im_/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/20090510215150im_/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/20090510215150im_/http://walrus.wr.usgs.gov/infobank/s/sb199ca/html/s-b1-99-ca.nav.150px.jpg)
s-b1-99-ca
01/13/99 - 01/13/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090510215150im_/http://walrus.wr.usgs.gov/infobank/s/sb199mb/html/s-b1-99-mb.nav.150px.jpg)
s-b1-99-mb
01/13/99 - 01/13/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090510215150im_/http://walrus.wr.usgs.gov/infobank/s/sb299ca/html/s-b2-99-ca.nav.150px.jpg)
s-b2-99-ca
03/10/99 - 03/10/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090510215150im_/http://walrus.wr.usgs.gov/infobank/s/sb399ca/html/s-b3-99-ca.nav.150px.jpg)
s-b3-99-ca
04/21/99 - 04/21/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090510215150im_/http://walrus.wr.usgs.gov/infobank/s/sb499ca/html/s-b4-99-ca.nav.150px.jpg)
s-b4-99-ca
11/18/99 - 11/18/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090510215150im_/http://walrus.wr.usgs.gov/infobank/s/sc199ca/html/s-c1-99-ca.nav.150px.jpg)
s-c1-99-ca
01/11/99 - 01/11/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090510215150im_/http://walrus.wr.usgs.gov/infobank/s/sc299ca/html/s-c2-99-ca.nav.150px.jpg)
s-c2-99-ca
03/09/99 - 03/09/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090510215150im_/http://walrus.wr.usgs.gov/infobank/s/sc399ca/html/s-c3-99-ca.nav.150px.jpg)
s-c3-99-ca
04/20/99 - 04/20/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090510215150im_/http://walrus.wr.usgs.gov/infobank/s/sc499ca/html/s-c4-99-ca.nav.150px.jpg)
s-c4-99-ca
11/17/99 - 11/17/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090510215150im_/http://walrus.wr.usgs.gov/infobank/s/sd199ca/html/s-d1-99-ca.nav.150px.jpg)
s-d1-99-ca
03/25/99 - 03/25/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090510215150im_/http://walrus.wr.usgs.gov/infobank/s/sd199oa/html/s-d1-99-oa.nav.150px.jpg)
s-d1-99-oa
08/30/99 - 08/30/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090510215150im_/http://walrus.wr.usgs.gov/infobank/s/sd299ca/html/s-d2-99-ca.nav.150px.jpg)
s-d2-99-ca
11/04/99 - 11/04/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090510215150im_/http://walrus.wr.usgs.gov/infobank/s/se199ca/html/s-e1-99-ca.nav.150px.jpg)
s-e1-99-ca
03/23/99 - 03/23/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090510215150im_/http://walrus.wr.usgs.gov/infobank/s/se299ca/html/s-e2-99-ca.nav.150px.jpg)
s-e2-99-ca
11/01/99 - 11/01/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090510215150im_/http://walrus.wr.usgs.gov/infobank/s/sk199mb/html/s-k1-99-mb.nav.150px.jpg)
s-k1-99-mb
01/11/99 - 01/11/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090510215150im_/http://walrus.wr.usgs.gov/infobank/s/sm199ca/html/s-m1-99-ca.nav.150px.jpg)
s-m1-99-ca
03/24/99 - 03/24/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090510215150im_/http://walrus.wr.usgs.gov/infobank/s/sm299ca/html/s-m2-99-ca.nav.150px.jpg)
s-m2-99-ca
11/03/99 - 11/03/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090510215150im_/http://walrus.wr.usgs.gov/infobank/s/sn199ca/html/s-n1-99-ca.nav.150px.jpg)
s-n1-99-ca
03/24/99 - 03/24/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090510215150im_/http://walrus.wr.usgs.gov/infobank/s/sn299ca/html/s-n2-99-ca.nav.150px.jpg)
s-n2-99-ca
11/02/99 - 11/02/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090510215150im_/http://walrus.wr.usgs.gov/infobank/s/sp199mu/html/s-p1-99-mu.nav.150px.jpg)
s-p1-99-mu
01/12/99 - 01/12/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090510215150im_/http://walrus.wr.usgs.gov/infobank/s/sp299mu/html/s-p2-99-mu.nav.150px.jpg)
s-p2-99-mu
07/01/99 - 07/01/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090510215150im_/http://walrus.wr.usgs.gov/infobank/s/ss199ca/html/s-s1-99-ca.nav.150px.jpg)
s-s1-99-ca
03/23/99 - 03/23/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090510215150im_/http://walrus.wr.usgs.gov/infobank/s/ss299ca/html/s-s2-99-ca.nav.150px.jpg)
s-s2-99-ca
11/02/99 - 11/02/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090510215150im_/http://walrus.wr.usgs.gov/infobank/w/wsg99ca/html/w-sg-99-ca.nav.150px.jpg)
wsg99ca
(W-SG-99-CA)
00/00/99 - 00/00/99
|
![thumbnail map](https://webarchive.library.unt.edu/web/20090510215150im_/http://walrus.wr.usgs.gov/infobank/w/wsp99ca/html/w-sp-99-ca.nav.150px.jpg)
wsp99ca
(W-SP-99-CA)
00/00/99 - 00/00/99
|