- Bertram, Paul E.; Edsall, Thomas A.; Manny, Bruce A.; Nichols, Susan J.; Schloesser, Donald W., 1991, Chemical contamination and physical characteristics of sediments in the upper Great Lakes connecting channels 1985: U.S. Environmental Protection Agency, Great Lakes National Program Office. Report GL-015-91; EPA-905/9-91/018, 80 p.,
- Booke, H. E.; O'Leary, J. A., 1991, Counting migratory fish with video: U.S. Fish and Wildlife Service Research Information Bulletin 105, 2 p.,
- Danielsen, K. C.; Halvorson, W. L., 1991, Valley oak seedling growth associated with selected grass species: U.S. Forest Service, Pacific Southwest Research Station General Technical Report PSW-126, p. 9-13,
- DelGiudice, G.D.; Nelson, M.E.; Mech, L.D., 1991, Winter nutrition and population ecology of white-tailed deer in the central Superior National Forest: U.S. Forest Service, North Central Forest Experiment Station. General Technical Report NC-147., 16,
- Douglas, C. L., 1991, Predicting bighorn lamb survival from weather patterns in Canyonlands National Park, Utah: National Park Service Technical Report CPSU/UNLV 031/08, 35 p.,
- Fleskes, J. P.; Klaas, E. E., 1991, Dabbling duck recruitment in relation to habitat and predators at Union Slough National Wildlife Refuge, Iowa: U.S. Fish and Wildlife Service Fish and Wildlife Technical Report 32, 19 p.,
- Fredrickson, Leigh H.; Kelley, Jr., James R., 1991, Chufa Biology and Management: U.S. Fish and Wildlife Service Fish and Wildlife Leaflet 13.4.18, 6 p.,
- Fries, J. N.; Fanning, A. H.; Lemm, C. A., 1991, Length-weight tables for striped bass: U.S. Fish and Wildlife Service San Marcos Leaflet 91-01
- Gibbs, J. P.;Longcore, J. R.;McAuley, D. G.;Ringelman, J. K., 1991, Use of Wetland Habitats by Selected Nongame Water Birds in Maine: U.S. Fish and Wildlife Service Fish and Wildlife Research No. 9, iii, 57,
- Henderson-Arzapalo, A.; Hawkinson, J.; Keyes, P., 1991, MS-222 used to separate phase I striped bass with uninflated swim bladders: U.S. Fish and Wildlife Service Research Information Bulletin 8, 2 p.,
- Hunter, R. B.; Saethre, M. B.; Medica, P. A.; Greger, P. D.; Romney, E. M., 1991, Biological studies in the impact zone of the liquefied gaseous fuels spill test facility in Frenchman Flat, Nevada: Reynolds Electrical and Engineering Co., Inc. Technical Report DOE/NV/10630-15, 42 p.,
- Jameson, R. J.; Estes, James A., 1991, Surveys of California sea otter population show positive growth trend: U.S. Fish and Wildlife Service , p. 91-99,
- Johnson, J. H.; Dropkin, D. S., 1991, Predation on recently released American shad in the Susquehanna River basin: U.S. Fish and Wildlife Service Research Information Bulletin 35, 2 p.,
- Kantrud, H. A., 1991, Wigeongrass (Ruppia maritima L.): a literature review: U.S. Fish and Wildlife Service Resource Publication 10, 58 pp.,
- Lemm, C. A.; Lemarie, D. P., 1991, Chiller system preserves size and developmental stage of brine shrimp for larval fish food: U.S. Fish and Wildlife Service Research Information Bulletin 93, 3 p.,
- Marion, J. L., 1991, Developing a Natural Resource Inventory and Monitoring Program for visitor impacts on recreation sites: A procedural manual: U.S. National Park Service. Natural Resources Report NPS/NRVT/NRR-91/06., 59,
- Miller, M. R.; Fleskes, J. P.; Orthmeyer, D. L.; Gilmer, D. S., 1991, High survival rates for female northern pintails in California‘s Sacramento Valley: U.S. Fish and Wildlife Service Research Information Bulletin 91-38
- Rathbun, G. B.; Benz, C. T., 1991, Third year of sea otter translocation completed in California: U.S. Fish and Wildlife Service Annual Report , p. 6-8,
- Ross, R. M.; Backman, T. W. H., 1991, Subyearling American shad concentrate in swifter current in the upper Delaware River: U.S. Fish and Wildlife Service Research Information Bulletin 58, 3 p.,
- Rottiers, D. V., 1991, Microwaves to remove skeletal bone from fish carcasses: U.S. Fish and Wildlife Service Research Information Bulletin 22, 2 p.,
- Rumsey, G. L.; Hughes, S. G., 1991, New starter diets for Atlantic salmon: U.S. Fish and Wildlife Service Research Information Bulletin 73, 2 p.,
- U.S. Geological Survey, 1991, GAP Analysis Bulletin Number 1: U.S. Fish and Wildlife Service GAP Bulletin 1, 25 p.,
- U.S. Interagency Advisory Committee on Water Data. Subcommittee on Sedimentation, 1991, Notes on sedimentation activities calendar year 1990: U.S. Geological Survey, Office of Water Data Coordination , xxix, 153 p.,
- van Wagtendonk, J. W., 1991, The evolution of National Park Service fire policy: U.S. Forest Service General Technical Report SE-69, p. 328-332,
- van Wagtendonk, J. W., 1991, GIS applications in fire management and research: U.S. Forest Service General Technical Report SE-69, p. 212-214,
