Allen, G.T. 1992. Metals and organic compounds in fish and sediments from the Missouri and lower Kansas Rivers in 1991. U.S. Fish and Wildlife Service Contaminant Report Number R6/509M/92. 24 pp. 

Allen, G.T. and S.H. Blackford. 1997. Arsenic, mercury, selenium, and organochlorine compounds in interior least tern eggs in the Northern Great Plains states, 1992-1994. U.S. Fish and Wildlife Service Contaminant Report Number R6/515M/97. 39 pp.

Allen, G.T. and T. Fannin. 1993. Background contaminants evaluation of the Republican River drainage: Colorado, Kansas, Nebraska. U.S. Fish and Wildlife Service Contaminant Report Number R6/512M/93. 52 pp.

Allen, G.T. and T. Nash. 1992. Contaminants survey of the proposed Marais des Cygnes National Wildlife Refuge. U.S. Fish and Wildlife Service Contaminant Report Number R6/508M/92. 22 pp. 

Allen, G.T., and R.M. Wilson. 1991. Metals and organic compounds in Missouri River fish in 1988. U.S. Fish and Wildlife Service Contaminant Report Number R6/503M/91. 69 pp.

Chirhart, J., L. Coppock, and A. Archuleta  2002  Contaminant Assessment Process Report for Arapaho National Wildlife Refuge. U.S. Fish and Wildlife Service. [PDF file 7.8M]  [PDF Appendix 5M]

Dickerson, K.K, T.W. Custer, C.M. Custer, and K. Allen. 2000. Bioavailability and exposure assessment of petroluem hydrocarbons and trace elements in birds nesting near the North Platte River, Casper, Wyoming. U.S. Fish and Wildlife Contaminant Report R6/716C/00. Cheyenne, WY. 72 pp. [PDF file, 423KB]

Dickerson, K. and P. Ramirez, Jr. 1993. An Investigation of Trace Element Contamination at Bamforth National Wildlife Refuge. U.S. Fish & Wildl. Serv. Contam. Rep. No. R6/707C/93. Cheyenne, WY. [PDF file, 4.1 MB]

Dickerson, K. and P. Ramirez, Jr. 1997. An investigation of irrigation-related contaminants in water, bottom sediment, and biota from Goshen County, Wyoming. U.S. Fish & Wildl. Serv. Contam. Rep. No. R6/711C/97. Cheyenne, WY. 44 pp.

Dickerson, K. and P. Ramirez, Jr. 1998. Trace elements in the aquatic bird food chain at the North Ponds, Texaco Refinery Casper, Wyoming. U.S. Fish & Wildl. Serv. Contam. Rep. No. R6/713C/98. Cheyenne, WY. 29 pp. [PDF file, 207KB]

Esmoil BJ, Schroeder KD, Fannin TE.  1994.  A contaminant evaluation of the Big Blue River in southeastern Nebraska.  US Fish and Wildlife Service.  Contaminant Report No. R6/60II/94.

Fannin, T.E. and B.J. Esmoil. 1993. Metal and organic residues in addled eggs of least terns and piping plovers in the Platte Valley of Nebraska. Pages 150-158 in Higgins, K.F. and M.R. Brashier, eds. Proceedings, The Missouri River and its tributaries piping plover and least tern symposium/workshop. South Dakota State University, Brookings, SD.

Goldberg, D.R, M.C. Samuel, T.E. Rocke, K.M. Johnson, G. Linz.  2004.  Could blackbird mortality from avicide DRC-1339 contribute to avain botulism outbreaks in North Dakota?  Wildlife Soc.  Bul.  32(3):  870-880.

Little, E.E., R.D. Calfee and K. Dickerson. 2002. Determination of impacts on the endangered Wyoming toad (Bufo baxteri) at Mortenson National Wildlife Refuge from ammonium nitrate concentrations. US Fish and Wildlife Service Contamination Report No. R6/719C/02. Columbia, Missouri & Cheyenne, Wyoming. [PDF file size 367KB]

Miesner, J.F. 2000. Contaminant residue analysis of fish tissues from Marais des Cygnes National Wildlife Refuge-Kansas. U.S. Fish and Wildlife Service Contaminant Report Number: R6/801M/1998. 32pp. [PDF file size 38 KB]

Nelson, K.J. and B.J. Esmoil. 1999. Background contaminants evaluation of Fort Niobrara and Valentine National Wildlife Refuge. US Fish and Wildlife Service Contaminant Report, Grand Island, NE.

Nelson, K.J. and B.J. Esmoil. 2001. Trace element concentrations in plants and sediments at Crescent Lake National Wildlife Refuge. US Fish and Wildlife Service Contaminant Report, Grand Island, NE.

Schwarz, M.S., K.R. Echols, M.J. Wolcott and K.J. Nelson.  2004.  Environmental contaminants associated with swine concentrated animal feeding operation and implications for McMurtrey National Wildlife Refuge.  US Fish and Wildlife Service Contaminant Report, Grand Island, NE. 

Ramirez, P. 1992. Trace Elements in Water, Sediments and Biota from Wetlands in the Laramie Basin and Their Relationship to the Recovery of the Endangered Wyoming Toad (Bufo hemiophrys baxteri). U.S. Fish & Wildl. Serv. Contam. Rep. No. R6/704C/92. Cheyenne, WY. [PDF file size 2MB]

Ramirez, P. 1992. Trace Element Concentrations in Flue Gas Desulfurization Wastewater from the Jim Bridger Power Plant, Sweetwater County, Wyoming. U.S. Fish & Wildl. Serv. Contam. Rep. No. R6/703C/92. Cheyenne, WY. April. [PDF file size 1.88MB]

Ramirez, P. 1993. Contaminants in Oil Field Produced Waters Discharged into the Loch Katrine Wetland Complex, Park County, Wyoming and Their Bioconcentration in the Aquatic Bird Food Chain. U.S. Fish and Wildlife Service Contaminant Report No. R6/706C/93. Cheyenne, WY. Dec. [PDF file size 398KB]

Ramirez, P. Jr. 1997. Environmental Contaminants in the Aquatic Bird Food Chain of an Oil Refinery Wastewater Pond in Wyoming. U.S. Fish & Wildl. Serv. Contam. Rep. R6/712c/97. Cheyenne, Wy. 28 pp. [PDF file, 76 KB]

Ramirez, P. 1998. Contaminants Information Bulletin-Evironmental contaminants in sediments from oilfield produced water discharge points. U.S. Fish & Wildl. Serv. Contam. Rep. No. R6/710C/98. Cheyenne, WY. 24 pp. [PDF file, 4.2 MB]

Ramirez, P. 2002. Oil Field Produced Water Discharges into Wetlands in Wyoming. U.S. Fish and Wildlife Service Contaminant Report # R6/718C/02. Cheyenne, WY. Aug. 15 pp. [1.8 MB]

Ramirez, P. and J. Armstrong. 1991. Trace Elements in Existing Wetlands and  Proposed Mitigation Sites in the U.S. Bureau of Reclamation's Shoshone Rehabilitation and Betterment Project, Park and Bighorn Counties, Wyoming. U.S. Fish & Wildlife Service, Cheyenne, WY. April. [PDF file size 3 MB]

Ramirez, P. and J. Armstrong. 1992. Environmental Contaminants Monitoring in Selected Wetlands of Wyoming {Biologically Active Elements Study]. U.S. Fish & Wildlife Service Contaminant Report No. R6/701C/92. Cheyenne, WY. Feb. [PDF file size 833KB]

Ramirez, P. and J. Armstrong. 1992. Environmental Contaminant Surveys in Three National Wildlife Refuges in Wyoming. U.S. Fish & Wildl. Serv. Contam. Rep. No. R6/702C/92. Cheyenne, WY. Feb. [PDF file size 3.1MB]

Ramirez, P. and K. Dickerson. 1997. Follow-up investigation of selenium and other trace elements in biota from the Riverton Reclamation Project, Fremont County, Wyoming. U.S. Fish & Wildl. Serv. Contam. Rep. No. R6/709C/97. Cheyenne, WY. 20 pp. [PDF file, 305 KB]

Ramirez, P. Jr. and K. Dickerson. 1998. Monitoring of selenium concentrations in biota from the Kendrick Reclamation Project, Natrona County, Wyoming, 1992- 1996. U.S. Fish and Wildl. Serv. Contam. Rep. No. R6/714C/99. Cheyenne, Wy. 16 pp. [PDF file, 109 KB]

Ramirez, P. Jr., K. Dickerson and M. Jennings . 1995. Trace element concentrations in water, sediment and biota from Pathfinder National Wildlife Refuge, Natrona and Carbon Counties, Wyoming. U.S. Fish & Wildl. Serv. Contam. Rep. No. R6/708C/97. Cheyenne, WY. 15 pp. [PDF file size 238KB]

Ramirez, P. and B. Rogers. 2000. Selenium in a Wyoming grassland community receiving wastewater from an in situ uranium mine. U.S. Fish and Wildlife Service Contaminant Report # R6/715C/00. Cheyenne, WY. Sept. 31. [PDF file, 992 KB]

Waddell, B. H., & Stanger, M. C. (1992). The influence of selenium on incubation patterns and nesting success of waterbirds at Ouray National Wildlife Refuge, Utah. (Report No. R6/400S/92). Salt Lake City, Utah: U.S. Fish and Wildlife Service. Call Number: 688

Wilson and Allen. Selenium in the aquatic environment of Quivira National Wildlife Refuge in 1987. R6 Studies - Kansas. 

Other:

Seiler, R.L., Skorupa, J.P., and Peltz, L.A., 1999, Areas susceptible to irrigation-induced selenium contamination of water and biota in the western United States: U.S. Geological Survey Circular 1180, 36 pages, [PDFDF file size 2,140 KB]