Collins, S. L. 1981. A comparison of nest-site and perch-site vegetation structure for seven species of warblers. Wilson Bulletin 93:542-547.

Johnson, O. W., P. M. Johnson, and P. L. Bruner. 1981. Wintering behavior and site-faithfulness of golden plover onOahu. 'Elepaio 41:123-130.

Tate, J. 1981. The Blue List for 1981: the first decade. American Birds 35:3-10.

Monson, G., and A. R. Phillips. 1981. Annotated checklist of the birds of Arizona. University of Arizona Press, Tucson, Arizona. 241 pp.

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.

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

Passmore, M. F. 1981. Population biology of the Common Ground-Dove and ecological relationships with Mourning and White-winged Doves in south Texas, Ph.D. dissertation, Texas A & M Univ., College Station, Texas. 96pp.

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

Yonge, K. S. 1981. The breeding cycle and annual production of the common loon (GAVIA IMMER) in the boreal forest region. University of Manitoba, Winnipeg, Manitoba. M.S. thesis.

Henny, C. J. and D. L. Meeker. 1981. An evaluation of blood plasma for monitoring DDE in birds of prey. Env. Pollution. 25A:291-304.

Schmidt, R. 1981. Ferruginous Hawk breeding documented in Sargent County, North Dakota. Prairie Naturalist 13:32.

Connelly, J. W., W. J. Arthur, and O. D. Markham. 1981. Sage grouse leks on recently disturbed sites. Journal of Range Management 34:153-154.

Nesom, G.L. and U.D. Roth. 1981. Erigeron scopulinus (Compositae), an endemic from the SW US. J. AZ-Nev Acad Sci 16:139-42.

Laudenslayer, W. F., Jr. 1981. Habitat utilization by birds of three desert riparian communities. Ph.D. Thesis, Arizona State University, Tempe. 148pp.

Cook, J. 1981. Thick-billed kingbird. New Mex. Ornith. Soc. field notes. Goodman, R.A. and J.P. Hubbard (eds.) vol 20, no. 2, June 1 - Nov. 30, 1981. P. 40

Hutto, R.L. 1981. Seasonal variation in the foraging behavior of some migratory wood warblers. Auk 98:765-777.

Wander, W. 1981. Breeding birds of southern New Jersey cedar swamps. Occasional Paper 138. Records of New Jersey Birds 6(4):51-65.

Jones, R.E. and R.J. Aulerich. 1981. Bibliography of foxes. Michigan State Univ., Agric. Exp. Sta. Jour. Art. No. 9871, 141 pp.

Unknown author. 1981. Noteworthy collections. Madrono 28(?):41-43.

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

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.

Schoenherr, A.A. 1981. The role of competition in the replacement of native fishes by introduced species, pp. 173-203 in: Naiman, R.J. and D.L. Soltz. Fishes in North American Deserts. John Wiley and Sons, NY.

Worthington, R. 1981. Status report on Silene plankii. Department of Biological Sciences, University of Texas at El Paso, El Paso, Texas.

Rosenberg, K.V., J.P. Hubbard, and G.H. Rosenberg. 1981. The winter season: December 1, 1980-February 28, 1981. Southwest region. American Birds. 35(3):325.

Scott, J. A., and S. A. Mattoon. 1981. Early stages of Speyeria nokomis (Nymphalidae). Journal of Research on the Lepidoptera 20:12-15.

Craven, S.R. 1981. The Canada goose (BRANTA CANADENSIS)- an annotated bibliography. U.S. Dept. of Interior, FWS. Special Scientific Report No. 231. 66 pp.

Noon, B. R. 1981. The distribution of an avian guild along a temperate elevational gradient: the importance and expresion of competition. Ecological Monographs 51:105-24.

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.

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

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.

Seegmiller, R. F., and R. D. Ohmart. 1981. Ecological relationships of feral burros and desert bighorn sheep. Wildlife Monographs No. 78:1-58.

Smith, E. L. 1981. Effects of canoeing on common loon production and survival on the Kenai National Wildlife Refuge, Alaska. Colorado State University, Fort Collins, Colorado. M.S. thesis.

Milburn, T. 1981. STATUS & DISTRIBUTION OF THE LOGGERHEAD SHRIKE, LANIUS LUDOVICIANUS IN THE NORTHEASTERN U.S. UNPUB- LISHED REPORT SUBMITTED TO THE USDI/FWS OFFICE OF ENDANGERED SPECIES. 77 PP.

Hulse, A. C. 1981. Ecology and reproduction of the parthenogenetic lizard Cnemidophorus uniparens (Teiidae). Ann. Carnegie Mus. Nat. Hist. 50:353-369.

Shugart, G. W., M. A. Fitch, and V. M. Shugart. 1981. Minimizing investigator disturbance in observational studiesof colonial birds: access to blind through tunnels. WilsonBull. 93:565-569.

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.

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

Cronquist, A. 1981. An integrated system of classification of flowering plants. Columbia Univ. Press, New York. 1262 pp.

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

Sepik, G. F., R. B. Owen, Jr., and M. W. Coulter. 1981. A landowner's guide to woodcock management in the Northeast. University of Maine Agricultural Experiment Station Misc. Rep. 253. 23 pp.

Spellenberg, R. 1981.Survey for threatened or endangered species on the Bitsi-Star Lake area, northwestern NM. BLM. 64p.

Mossman, M. 1981. The 1981 black tern survey. Unpubl. report, Office of Endangered and Nongame Species, Wisconsin Dept. of Natural Resources, Madison, WI. 9 pp.

Apfelbaum, S., and A. Haney. 1981. Bird populations before and after wild fire in a Great Lakes USA pine forest. Condor 83(4):347-354.

Johnson, T.B. and R.B. Spicer. 1981. Mountain plovers on the New Mexico-Arizona border. Continental Birdlife 2(3): 69-73. June 1981.

Titus, K., and J. A. Mosher. 1981. Nest site habitat selection by woodland hawks in the central Appalachians. Auk 98:270-281.

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

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.