Allen, G.T. and P. Ramirez. 1990. A review of bird deaths on barbed-wire fences. Wilson Bull. 102(3):553-558.

Custer, T.W., C.M. Custer, K. Dickerson, K. Allen, M.J. Melancon, and L.J. Schmidt. 2001. Polycyclic aromatic hydrocarbons, aliphatic hydrocarbons, trace elements, and monooxygenase activity in birds nesting on the North Platte River, Casper, Wyoming, USA. Environmental Toxicology and Chemistry 20(3):624-631.

DeWeese, L.R., B. Waddell, D. Palawski and P. Ramirez. 1992. Organochlorine pesticide and trace element contamination of avian prey used by Peregrine falcons in four Rocky Mountain States: Ten years after. US Fish and Wildlife Service Contaminants Report, Colorado, Utah, Montana, Wyoming.

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.K., W.A. Hubert, and H.L. Bergman. 1993. Toxicity Assessment of Water from Basins Receiving Irrigation Drainwater. Study presented by Kim Dickerson at the SETAC 14th Annual Meeting, November 14 - 18, 1994 at Houston, TX.

Dickerson, K.K., W.A. Hubert, and H.L. Bergman. 1996. Toxicity Assessment of Water from Lakes and Wetlands Receiving Irrigation Drain Water. Environ. Toxicol. Chem. 15 (7): 1097-1101.

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. 1997. A Comparison of Boron and Selenium Concentrations in Biota from Irrigation Drainwater Projects Throughout Wyoming. Study presented by Kim Dickerson at the SETAC 18th Annual Meeting, November 16 - 20, 1997 at San Francisco, CA.

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. [PDF file, 421KB]

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]

Dickerson, K.; A. Farag; A. Gray; D. Harper; and W. Brumbaugh.  2007.  Lead shot availability to birds using the North Platte River near a trap and skeet range. US Fish and Wildlife Service Contamination Report No. R6/722C/06. Cheyenne, Wyoming. 47 pp.[PDF file 1.3 MB]

Esmoil, B.J. and S.H. Anderson. 1995. Wildlife mortality associated with oil pits in Wyoming. Prairie Naturalist. 27(2): 81-88pp.

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. R6/719/02. Columbia, Missouri & Cheyenne, Wyoming. [PDF file size 367KB]

Naftz, D.L., R.B. See and P. Ramirez. 1993. Selenium source identification and biogeochemical processes controlling selenium in surface water and biota, Kendrick Reclamation Project, Wyoming, U.S.A. Applied Geochem.8:115-126.

Peterson, D.A., T.F. Harms, P. Ramirez, Jr., G.T. Harms, and A.H. Christenson. 1991. Reconnaissance Investigation of Water Quality, Bottom Sediment, and Biota Associated with Irrigation Drainage in the Riverton Reclamation Project, Wyoming, 1988-89. U.S. Geological Survey Water Resources Investigations Report 90-4187.

Peterson, D.A., W.E. Jomes and A.G. Morton. 1998. Reconnaissance investigation of water quality, bottom sediment, and biota associated with irrigation drainage in the Kendrick Reclamation Project Area, Wyoming, 1986-1987. US Geological Survey Water Resource Investigations Report 87-4255.

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. 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. 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. 1993. Environmental Contaminants Issues in Wyoming. U.S. Fish & Wildl. Serv. Contam. Rep. No. R6/705C/93. Cheyenne, WY. Oct.

Ramirez, P. 1994. Contaminants in oil field produced waters discharged into the Loch Katrine wetland complex, Park County, Wyoming. Rocky Mtn. Symp. on Environmental Issues in Oil & Gas Operations. July 11-13. Golden, CO.

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.Jr. 2005. Assessment of contaminants associated with coal bed methane-produced water and its suitability for wetland creation or enhancement projects. US Fish and Wildlife Service Contamination Report No. R6/721C/05. Columbia, Missouri & Cheyenne, Wyoming.

Ramirez, P. 2005. Oil field-produced water discharges into wetlands: Benefits and risks to wildlife. Environmental Geosciences, v. 12, no. 2 (June), pp. 65–72

Ramirez, P. Jr. 2008. Trace Elements and Petroleum Hydrocarbons in the Aquatic Bird Food Chain Of Process Water Evaporation Ponds at the Little America Refinery, Casper, Wyoming. US Fish and Wildlife Service Contamination Report No. R6/724C/08. Cheyenne, WY. 36 pp. [PDF file size 2.2 MB]

Ramirez, P. Jr., G.T. Allen and J. Malloy. 1993. Selenium in Aquatic Birds Nesting in the Kendrick Reclamation Project, Natrona County, Wyoming: Apparent Impacts from Irrigation Drainwater in Planning, Rehabilitation and Treatment of Disturbed Lands, Sixth Billings Symposium, Billings, MT. Reclamation Res. Unit Pub. No. 9301. Montana State Univ. Bozeman, MT.

Ramirez, P. Jr. and J.A. Armstrong. 1990. Environmental contaminants monitoring in selected wildlife refuges in Wyoming. US Fish and Wildlife Service, Cheyenne, WY.

Ramirez, P. Jr. and J.A. Armstrong. 1990. Trace elements concentrations in water and sediment from Seedskadee NWR Well #1, Sweet Water Co., Wyoming. Cheyenne, WY.

Ramirez, P. Jr. and J.A. Armstrong. 1990. Trace elements in water and sediments from wetlands in the Laramie Plains and their relationship to the recovery of the Wyoming toad (Bufo hemiophrys baxteri). US Fish and Wildlife Service Contaminant Report, Cheyenne, WY.

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. Jr. and J.A. Armstrong. 1992. Selenium in Aquatic Birds Inhabiting the Kendrick Reclamation Project, Wyoming: Apparent Impacts from Irrigation Drainwater. in Society of Environ. Toxicol. and Chem. 13th Annual Meeting. Cincinnati, OH. Nov. 8-12.

Ramirez, P. Jr. and S. Brockmann. 1991. Grease Traps Wyoming Wildlife Magazine. Wyoming Game & Fish Dept. Cheyenne, WY.

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. Jr. and B.J. Esmoil. 1993. Bird Mortalities Associated with Mining and Oilfield Waste Pits in Wyoming. in Planning, Rehabilitation and Treatment of Disturbed Lands, Sixth Billings Symposium, Billings, MT. Reclamation Res. Unit Pub. No. 9301. Montana State Univ. Bozeman, MT.

Ramirez, P. Jr., M. Jennings and K. Dickerson. 1994. A Comparison of Trace Element Concentrations in Biota from Four Irrigation Projects in Wyoming. Study presented by Kim Dickerson and Mary Jennings at the SETAC 15th Annual Meeting, October 30 - November 3, 1994 at Denver, CO.

Ramirez, P. Jr., M. Jennings and K. Dickerson. 1994. Selenium in Fish and the Aquatic Bird Food Chain Kendrick Reclamation Project, Natrona County, Wyoming. in Proc. Annual Summer Symposium of Am. Water Res. Assoc. Effects of Human-Induced Changes on Hydrologic Systems. Jackson, WY. June 26-29. pp: 1043-1053.

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]

Ramirez, P. and B.P. Rogers. 2002. Selenium in a Wyoming grassland community receiving wastewater from an in situ uranium mine. Arch. Environ. Contam. Toxicol 42(4):431-436.

See, R.B.; D.L. Naftz; D.A. Peterson; J.G. Crock; J.A. Erdman; R.C. Severson; P. Ramirez, Jr. and J.A. Armstrong. 1992. Detailed Study of Selenium in soil, Representative Plants, Water, Bottom Sediment, and Biota in the Kendrick Reclamation Project Area, Wyoming, 1988-89. U.S. Geological Survey Water Investigations Report 91-4131. Cheyenne.

See, R.B.; D.A. Peterson; and P. Ramirez, Jr. 1992. Physical, Chemical and Biological Data for Detailed Study of Irrigation Drainage in the Kendrick Reclamation Project Area, Wyoming, 1988-90. U.S. Geological Survey Open-File Report 91-533. Cheyenne, WY.

Skorupa, J.P., H.M. Ohlendorf, R.L. Hothem, D.L. Roster, R.G. Stein, W.L. Hohman, D.Welsh, C.M. Marn, S.J. Detwiler, J. Winkel, P. Ramirez, J.A. Armstrong and P.J. Leonard. 1993. Comparative ecotoxicology of selenium for breeding stilts and avocets exposed to irrigation drain water. Proc. Wildl. Soc., Western Section. Monterey, CA. Feb.

Stephens, R.M.; A.S. Johnson; R. Plumb; K.K. Dickerson; M.C. McKinstry; and S.H. Anderson.  2006.  Secondary lead poinsoning in Golden Eagle and Ferruginous Hawk chicks consuming shot Black-tailed Prairie Dogs, Thunder Basin National Grassland, Wyoming.  US Fish and Wildlife Service Contamination Report No. R6/720C/05. Columbia, Missouri & Cheyenne, Wyoming.  19 pp. [PDF file size 310 KB]