Barrows, C.W. 1981. Roost selection by spotted owls: an adaptation to heat stress. Condor 83:302-309.

Smith, J.N.M. 1981. Cowbird parasitism, host fitness and age of the host female in an island Song Sparrow population. Condor 83:152-161.

Hillis, D. M. 1981. Premating isolating mechanisms among three species of the Rana pipiens complex in Texas and Oklahoma. Copeia 1981:312-319.

Proctor, N. 1981. The black rail: mystery bird of the marsh. Connecticut Warbler 1(2):15-16.

Ferris, C.D. and F.M. Brown (eds). 1981. Butterflies of the Rocky Mountains. University of Oklahoma Press. Norman. 442 pp.

Maser, C., B. R. Mate, J. F. Franklin, and C. T. Dyrness. 1981. Natural history of Oregon coast mammals. Pacific Northwest Forest and Range Expt. Sta., USDA, Forest Service, Gen Tech. Rep. PNW-133:1-496.

Schwartz, C. W., and E. R. Schwartz. 1981. The wild mammals of Missouri. University of Missouri Press, Columbia. 356 pp.

Gile, L.H., J.W. Hawley, and R.B. Grossman. 1981. Soils and geomorphology in the basin and range area of southern New Mexico; guidebook to the desert project. New Mexico Bureau of Mines and Mineral Resources.

Knight, P.J. 1981. Status report - Astragalus humillimus. New Mexico State Heritage Program.

Egbert, J. 1981. Field inventories in New Mexico of selected Gila Valley birds. May-June 1981.

Pyle, R. M. 1981. The Audubon Society Field Guide to North American Butterflies. Alfred A. Knopf, New York, New York. 916 pp. + color plates.

Spellenberg, R. 1981. Status Report on Penstemon alamosensis. 21p.

Bureau of Land Management. 1981. Hualapai-Aquarius management framework plan. Phoenix District, Pheonix, AZ.

Ryan, M.R., J.J. Dinsmore, and R.B. Dahlgren. 1981. Ecology of Willets and Marbled Godwits in the glaciated prairie region. U.S. Fish and Wildlife Service, Northern Prairie Wildlife Research Center, Project 2170. 3 pp.

Greenberg, R. 1981. Frugivory in some migrant tropical forest wood warblers. Biotropica 13: 215-223.

Reynolds, R.P. 1981. Elevational record for Euderma maculatum (Chiroptera: Vespertilionidae) SW Nat 26:91-92.

Bibby, C. J. 1981. Wintering bitterns in Britain. British Birds 74:1-10.

Keran, D. 1981. The incidence of man-caused and natural mortalities to raptors. Raptor Research 15:108-12.

Suter, G. W., II and J. L. Joness. 1981. Criteria for Golden Eagle, Ferruginous Hawk, and Prairie Falcon nest site protection. Raptor Res. 15:12-18.

Bednarz, J. C., and J. J. Dinsmore. 1981. Status, habitat use and management of red-shouldered hawks in Iowa. J. Wildlife Manage. 45:236-241.

Snyder, D. E. 1981. Contributions to a guide to the cypriniform fish larvae of the upper Colorado River system in Colorado. United States Bureau of Land Management, Biological Sciences Series 3, Denver, Colorado. 81 pp.

Aniskowicz, B. T. 1981. Behavior of a male least bittern IXOBRYCHUS EXILIS after loss of mate. Wilson Bulletin 93:395-397.

Houston, C. S. 1981. An assessment of Walter Raine and his Saskatchewan records. Bule Jay 39:168-81.

Rundle, W.D., and L.F. Fredrickson. 1981. Managing seasonally flooded impoundments for migrant rails and shorebirds. Wild. Soc. Bull. 9:80-87.

McDonald, J.N. 1981. North American Bison -- their classification and evolution. 316 pp.

Steele, B., F. Johnson, and S. Brunsfeld, eds. 1981. Vascular plant species of concern in Idaho. Forest, Wildlife and Range Experiment Station, Moscow, ID. 161 pp.

Minckley, W. L. 1981. Ecological studies of Aravaipa Creek, central Arizona, relative to past, present, and future uses. Final Report. U.S. Bureau of Land Management, Safford, Arizona. Contract Number YA-512-CT6-98. 362 pp.

Hall, E.R. and K.R. Kelson. 1981. The mammals of North America. Ronald Press, N.Y. 1:xxx + 1-546 + 79.

Knight, P.J. 1981. Unpublished report on Sclerocactus mesae-verdae. 47 pp.

Hector, D.P. 1981. The habitat, diet and foraging behavior of the Aplomado Falcon, FALCO FEMORALIS (Temminck). M.S. thesis, Oklahoma State University, Stillwater. 189 pp.

Wallmo, O.C. 1981. The mule and black-tailed deer of North America. 605 pp.

Stephens, R. 1981. Letter to Major General Alan A. Nord from R. Stephens of US Fish and Wildlife regarding Penstemon alamosensis habitat (7 Oct 1981) with response from A. Nord (16 Oct 1981).

Faanes, C.A. 1981. Birds of the St. Croix River Valley: Minnesota and Wisconsin. North American Fauna 73. U.S. Fish and Wildlife Service, Washington, DC. 196 pp.

PNDMCI01NMUS, Legacy reference. Physical copy not yet located.

Taylor, D.W. 1981. Photographs of mollusc habitat taken on field survey in New Mexico.

U.S. Fish and Wildlife Service (USFWS). 1981. Determination of two New Mexico plants to be endangered species and threatened species, with critical habitat. Federal Register 46(12): 5730-5733.

Hafner, D. J., K. E. Petersen, and T. L. Yates. 1981. Evolutionary relationships of jumping mice (genus Zapus) of the southwestern United States. Journal of Mammalogy 62:501-512.

Roboski, J. C. and M. K. Causey. 1981. Incidence, habitat use, and chronology of woodcock nesting in Alabama. Journal of Wildlife Management 45:793-797.

Blem, C.R. 1981. Heterodon platyrhinos. Catalogue of American Amphibians and Reptiles. SSAR. NO. 282:1-2.

Kimmel, V. L., and L. H. Fredrickson. 1981. Nesting ecology of the red-shouldered hawk in southeastern missouri. Trans. Missouri Acad. Sci. 15:21-27.

Whitcomb, R. F., C. S. Robbins, J. F. Lynch, B. L. Whitcomb, M. K. Klimciewicz, and D. Bystrak. 1981. Effects of forest fragmentation on avifauna of the eastern deciduous forest. Pages 125-206 in R. L. Burgess, and B. L. Sharpe (editors). Forest island dy

Best, L.B., D.F. Stauffer, A.R. Geier, K.L. Varland, J.P. Vogler, R.B. Dahlgren, and R.Q. Landers. 1981. Effects of habitat alterations on riparian plant and animal communities in Iowa. U.S. Department of the Interior, Fish and Wildlife Service, FWS/OBS-8

Beedy, E.C. 1981. Bird communities and forest structure in the Sierra Nevada of California. Condor 83:97-105.

Thompson, C.F., and B.M. Gottfried. 1981. Nest discovery and selection by Brown-headed Cowbirds. Condor 83:268-269.

Chernoff, B., J. V. Conner, and C. F. Bryan. 1981. Systematics of the Menidia beryllina complex (Pisces: Atherinidae) from the Gulf of Mexico and its tributaries. Copeia 1981:319-336.

Hurlbert, S. H., and M. S. Mulla. 1981. Impacts of mosquitofish (Gambusia affinis) predation on plankton communities. Hydrobiologica 83:125-151.

Savaloja, T. 1981. Yellow Rail. Birding 13(3):80-85.

Messick, J. P., and M. G. Hornocker. 1981. Ecology of the badger in southwestern Idaho. Wildlife Monographs 76:1-53.

Isely, D. 1981. Leguminosae of the United States. III. Subfamily Papilionoidae: Tribes Sophoreae, Podalyrieae, Loteae. Memoirs of the New York Botanical Garden 25(3): 1-264.

Stevenson, J.S., J.R. Koplin, and C.E. Kennedy. 1981. Memo to Forest Supervisor from Jancie Stevenson, USFS Wildlife Management Biologist, regarding wildlife in the Bunk Robinson RARE II Area (Guadalupe Canyon). . 9 p.

USFWS. 1981. Recovery plan for the Comanche Springs pupfish. Prepared by the Rio Grande Fishes Recovery Team.

Worthington, R. D. 1981. Locations of two populations of Sneed's cactus in the Anthony Gap area. University of Texas. Department of Biological Sciences. El Paso, Texas 79968. 6 pages.

Landye, J.J. 1981. Current status of endangered, threatened, and/or rare mollusks of New Mexico and Arizona. Report to the USDI Fish and Wildlife Service, Office of Rare and Endangered Species, Bureau of Sport Fisheries and Wildlife, Albequerque, New Mexi

Siler, G.J., and C.E. Rogers. 1981. New and interesting distribution records for HELIANTHUS PARADOXUS. Southwestern Naturalist 6(4):431.

Hafner, D.J., K.E. Peterson and T.L. Yates. 1981. Evolutionary relationships of jumping mice (Genus Zapus) of the southwestern United States. J. Mamm., 62(3):501-512.

Schreiber, D. C., and W. L. Minckley. 1981. Feeding interrelationships of native fishes in a Sonoran Desert stream. Great Basin Naturalist 41:409-426.

Greenwalt, L. 1981. Rules and regulations: Eriogonum gypsophilum, Hedeoma todsenii. Federal Register. 46 (12):5730-5733.

Cameron, G.N. and S.R. Spencer. 1981. Sigmodon hispidus. Am. Soc. Mamm., Mammalian Species No. 158. 9 pp.

Lynch, J. M. 1981. Status of the cerulean warbler in the Roanoke River Basin of North Carolina. Chat 45(2):29-35.

Hay, M. A., and G. R. Lingle. 1981. The birds of Mormon Island Crane Meadows, Nebraska. Report to The Nature Conservancy, June 1981. 206 pp.