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.

Havlik, M.E. 1981. The historic and present distribution of the endangered mollusk Lampsilis higginsi (Lea 1857). Bulletin of the American Malacological Union for 1980: 19-22.

Rickard, W. H., R. E. Fitzner, and C. E. Cushing. 1981. Biological colonization of an industrial pond, status after two decades. Environmental Conservation 8:241-7.

Morrison, M. L. 1981a. Population trends of the Loggerhead Shrike in the United States. Am. Birds 35(4): 754-757.

Ferguson, H.L., and P.D. Jorgensen. 1981. An efficient trapping technique for burrowing owls. North American Bird Bander Oct.-Dec.:149.

Munther, G. L. 1981. Beaver management in grazed riparian ecosystems. Proceedings of the Wildlife-Livestock Relationships Symposium, Coeur d'Alene, Idaho, pages 234-241.

Hall, E. R. 1981a. The Mammals of North America, second edition. Vols. I & II. John Wiley & Sons, New York, New York. 1181 pp.

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

Fritts, S. H., and L. D. Mech. 1981. Dynamics, movements, and feeding ecology of a newly protected wolf population in northwestern Minnesota. Wildlife Monographs No. 80:1-79.

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).

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.

Inouye, R. S., N. J. Huntly and D. W. Inouye. 1981. Non-random orientation of Gila Woodpecker nest entrances in saguaro cacti. Condor 83:88-89.

Rollins, D. 1981. Diets of sympatric bobwhite and scaled quail in Oklahoma. Proceedings of the Annual Conference of the Southeastern Association of Fish and Wildlife Agencies 35:239-248.

Opler, P. A. 1981. Management of prairie habitats for insect conservation. Natural Areas J. 1(4): 3-6.

Fitch, H.S., W.S. Brown, and W.S. Parker. 1981. Coluber mormon, a species distinct from C. constrictor. Trans. Kansas Acad. Sci. 84:196-203.

Potter, E. F. 1981. Effects of cool weather on nesting behavior and development in the Yellow-billed Cuckoo. Chat 45:15-16.

Hall, E. R. 1981a. The Mammals of North America, second edition. Vols. I & II. John Wiley & Sons, New York, New York. 1181 pp.

Titus, J. R., and L. W. VanDruff. 1981. Response of the common loon to recreational pressure in the Boundary Waters Canoe Area, northeastern Minnesota. Wildl. Monogr. No. 79:1-59.

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.

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.

LaFontaine, G. 1981. Caddisflies. The Lyons Press, Guilford, Connecticut. 336 pp.

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.

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.

Kantrud, H. A. 1981. Grazing intensity effects on the breeding avifauna of North Dakota native grasslands. Canadian Field-Naturalist 95:404-417.

Schneider, D.C., and B.A. Harrington. 1981. Timing of shorebird migration in relation to prey depletion. Auk 98:801-81.

Platz, J. E. 1981. Suture zone dynamics: Texas populations of Rana berlandieri and R. blairi. Copeia 1981:733-734.

Hamerstrom, F., and M. Kopeny. 1981. Harrier nest-site/vegetation. Raptor Res. 15:86-8.

Bee, J.W., R.S. Hoffmann, G. Blass, R.R. Paterson. 1981. Mammals in Kansas. Universtiy of Kansas Publications, Mus. Nat.Hist., Public Ed. Series No. 7., Lawrence.

Hayes, B. 1981. The grizzly bear: portraits from life. 370 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.

U.S. Fish and Wildlife Service (USFWS). 1981. Plymouth red-bellied turtle recovery plan. U.S. Fish and Wildlife Service, Region 5. 13 pp.

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

Miller, L. D. and F. M. Brown. 1981. A Catalogue/Checklist of the Butterflies of America North of Mexico. The Lepidopterists' Society Memoir No. 2, Sarasota, Florida. 280 pp.

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

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.

Seiler, G.J., L. Cuk, and C.E. Rogers. 1981. New and interesting distribution records for Helianthus paradoxus (heiser) Asteraceae. Southwestern Naturalist 26(4): 431-432.

Ralph, C. J. 1981. Age ratios and their possible use in determining autumn routes of passerine migrants. Wilson Bulletin 93:164-188.

Hayward, B. 1981. Mexican chickadee. New Mexico Ornithological Society field notes. R.A. Goodman (ed) Vol 21(1):10. 1 Dec 81 - 28 Feb 82.

Brune, G. 1981. Springs of Texas. Volume 1. Branch-Smith, Inc. Fort Worth, Texas.

Johnsgard, P. A. 1981. The plovers, sandpipers, and snipes of the world. Univ. Nebraska Press, Lincoln. 493 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.

Worthington, R.D. 1981. Status report [on Silene plankii]. Report prepared for U.S. Fish & Wildlife Service, Albuquerque, New Mexico.

Otte, Daniel. 1981. The North American Grasshoppers. Volume 1. Acrididae (Gomphocerinae and Acridinae). Harvard University Press. 275 pp.

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

Sedgwick, J. A. 1981. Breeding bird and small mammal habitat relationships in northwestern Colorado. Ph.D. Dissertation, Colorado State University. 139 pp.

Goldwasser, S. 1981. Habitat requirements of the Least Bell's Vireo. Final Rep., California Dept. of Fish and Game, Sacramento, CA.

Byrd, G. V., and C. F. Zeillemaker. 1981. Ecology of nesting Hawaiian common gallinules at Hanalei, Hawaii. W. Birds 12:105-116.

Kerlinger, P., and C. Doremus. 1981. Habitat disturbance and the decline of dominant avian species in pine barrens of the northeastern United States. American Birds 35:16-20.

Veselack, M. S. and J. J. Nisbet. 1981. The distribution and uses of Arundo donax (abstract). Proc. Indiana Acad. Sci. 90:92.

Alvo, R. 1981. Marsh nesting of common loons (GAVIA IMMER). Can. Field Nat. 95:357.

Singer, F. J., et al. 1981. Home ranges, movements, and habitat use of European wild boar in Tennessee. J. Wildl. Manage. 45:343-353.