Stinnett, S. S. 1981. Food habits and effects of Gunnison's, Zuni, and black-tailed prairie dogs on plant communities in New Mexico. NMSU, Las Cruces, NM. M.S. Thesis. 138 pp.

Engstrom, M. D., and D. E. Wilson. 1981. Systematics of ANTROZOUS DUBIAQUERCUS (Chiroptera: Vespertilionidae), with comments on the status of BAUERUS Van Gelder. Annals of Carnegie Museum 50:371-383.

Karasov, W. H. 1981. Daily energy expenditure and the cost of activity in a free-living mammal. Oecologia 51:253-259.

Whitmore, R.C. 1981. Structural characteristics of Grasshopper Sparrow habitat. Journal of Wildlife Management 45:811-814.

Massey, B. W., and J. L. Atwood. 1981. Second-wave nesting of the California least tern: age composition and reproductive success. Auk 98:596-605.

Walker, B.H., D. Ludwig, C.S. Holling, and R.M. Peterman. 1981. Stability of semi-arid savanna grazing systems. Journal of Ecology. 69:473-498.

Parenti, L. R. 1981. A phylogenetic and biogeographic analysis of cyprinodontiform fishes (Teleostei, Atherinomorpha). Bulletin of the American Museum Natural History 168:335-557.

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).

Hull, C. 1981. Great Lakes piping plover in trouble. Michigan Department of Natural Resources, Lansing, Michigan. 2 pp.

Fischer, D. H. 1981. Wintering ecology of thrashers in southern Texas. Condor 83:340-346.

Reich, L.M. 1981. Microtus pennsylvanicus. Am. Soc. Mamm., Mammalian Species No. 159. 8pp.

Taylor, D.W. 1981. Photograph of Lymnaea caperata habitat taken on field survey of mussels in New Mexico on May 15, 1981.

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.

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

Allen, O.N. and E.K. Allen. 1981. The Leguminosae: A source book of characteristics, uses and nodulation. The Univ. of Wisconsin Press, Madison, WI.

Whittemore, M. 1981. Chimney swifts and their relatives. Nature Books. 176 pp.

Craig, R. J. 1981. Comparative ecology of the Louisiana and Northern Waterthrushes. Phd. Diss., Univ. of Connecticut, Storrs.

Koppinger, D.G. 1981. Occurence map of Psoralea pentophylla. Arizona Natural Heritage Program. USFS.

Fitch, J.H., K.A. Shump, Jr., and A.U. Shump. 1981. Myotis velifer. Mammalian species 149:1-5.

O'Meara, T., J. Haufler, L. Stelter, and J. Nagy. 1981. Nongame wildlife responses to chaining of Pinyon-Juniper woodlands. Journal of Wildlife Management 45(2):381-389.

Facey, D.E. and G. Labar. 1981. Biology of American eels in Lake Champlain, Vermont. Transactions of the American Fisheries Society 110(3): 396-402.

King, B. 1981. The field identification of North American pipits. American Birds 35:778-88.

Williams, J. E., and G. R. Wilde. 1981. Taxonomic status and morphology of isolated populations of the White River springfish, Crenichthys baileyi (Cyprinodontidae). Southwestern Naturalist 25(4):485-503.

McCabe, T. L. 1981. The Dakota skipper, Hesperia dacotae (Skinner): range and biology, with special reference to North Dakota. Journal of the Lepidopterists' Society 35(3): 179-193.

Wallis, C.A., and C.R. Wershler. 1981. Status and breeding of Mountain Plovers (Charadrius montanus) in Canada. Canadian Field-Naturalist 95:133-136.

Peterson, F.F. 1981. Landforms of the basin & range province - defined for soil survey. Technical Bulletin 28. Nevada Agricultural Experiment Station, University of Nevada, Reno, Nevada

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.

Pearce, P. A. and N. R. Garrity. 1981. Impact of aminocarb (Matacil) spraying on forest songbirds in northern New Brunswick. Canadian Wildlife Service, Progress Notes 121.

Forbes, G. S. 1981. Description and taxonomic implications of an unusual Arizona population of APODEMIA MORMO (Riodinidae). Jounal of the REsearch on the Lepidoptera 18:201-207.

Reynolds, T.D. 1981. Nesting of the Sage Thrasher, Sage Sparrow, and Brewer's Sparrow in southeastern Idaho. Condor 83:61-64.

Iverson, J. B. 1981. Biosystematics of the Kinosternon hirtipes species group (Testudines: Kinosternidae). Tulane Stud. Zool. Bot. 23(1):1-74.

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

Cole, C. J., and L. M. Hardy. 1981. Systematics of North American colubrid snakes related to Tantilla planiceps (Blainville). Bull. Am. Mus. Nat. Hist. 171:199-284.

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

Green, B.H., and H.D. Smith. 1981. Habitat utilization by sage sparrows in mixed desert shrub community. Abstract only. Encyclia 58:159.

Payne, N. F. 1981. Accuracy of aerial censusing for beaver colonies in Newfoundland. Journal of Wildlife Management 45:1014-1016.

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

Frest, T.J. and R.S. Rhodes, II. 1981. Oreohelix strigosa cooperi (Binney) in the Midwest Pleistocene. The Nautilus, 95: 47-55.

Lawson, R., and H. C. Dessauer. 1981. Electrophoretic evaluation of the colubrid genus ELAPHE Fitzinger. Isozyme Bull. 14:83.

Zammuto, R. M., E. C. Franks, and C. R. Preston. 1981. Factors associated with the interval between feeding visits in brood-rearing Chimney Swifts. Journal of Field Ornithology 52:134-139.

Merritt, J.F. 1981. Clethrionomys gapperi. Am. Soc. Mamm.,Mammalian Species No. 146. 9 pp.

Wentworth, T.R. 1981. Vegetation on limestone and granite in the Mule Mtn, Arizona. Ecology. 62(2):469-482.

Trautman, M. B. 1981. The fishes of Ohio. Second edition. Ohio State University Press, Columbus, Ohio. 782 pp.

Worthington, R. 1981. Noteworthy Collection of Salvia summa. Department of Biological Sciences at the University of Texas, El Paso. USFS.

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.

Pyle, R.M., 1981. The Audubon Society Field Guide to North America Butterflies. Chanitcleer Press, Alfred A. Knopf, NY. 916 pp, 759 color figures.

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.

Craven, S. R. 1981. The Canada goose (BRANTA CANADENSIS)- an annotated bibliography. U. S. Fish & Wildl. Serv., Spec.Sci. Rep.-Wildl. No. 231. 66 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.

Hammerquist-Wilson, M. N. and J. A. Crawford. 1981. Response of bobwhite to cover changes within three grazing systems. Jounal of Range Management 34:213-215.

Phillips, D. P., W. E. Childers, and G. S. Whitt. 1981. Management implications for different genetic stocks of largemouth bass (Micropterus salmoides) in the United States. Canadian Journal of Fisheries and Aquatic Sciences 38:1715-1723.

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.

Freedman, B., C. Beauchamp, I. A. McLaren, and S. I. Tingley. 1981. Forestry management practices and populations of breeding birds in a hardwood forest in Nova Scotia. Canadian Field-Naturalist 95:307-311.

Matteson, S. W., and J. O. Riley. 1981. Distribution and nesting success of Zone-tailed Hawks in west Texas. Wilson Bulletin 107:719-723.

PNDMCI01NMUS, Legacy reference. Physical copy not yet located.

Day, J. C. U. 1981. Status of bitterns in Europe since 1976. British Birds. 74:10-6.

Morrison, M.L. 1981b. The structure of western warbler assemblages: analysis of foraging behavior and habitat selection in Oregon. Auk 98:578-588.

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