Williams, L. 1952b. Breeding behavior of the Brewer blackbird. Condor 54:3-47.

Bailey, J. E. 1952. Life history and ecology of the sculpin Cottus bairdi punctulatus in southwestern Montana. Copeia 1952(4):243-255.

Stewart, R. E., and C. S. Robbins. 1952. Birds of Maryland and the District of Columbia. North American Fauna 62, U.S. Fish and Wildlife Service. 401 pp.

Pough, R. H. 1951. Audubon waterbird guide. Doubleday Company, Garden City, New York. 352 pp.

Smith, P. W. 1951. A new frog and a new turtle from the Western Illinois sand praries. Chicago Academy of Science Bulletin 9(10):189-9.

Dexter, R. W. 1951. Diary of five Chimney Swifts. Ohio Journal of Science 51:42-46.

Stewart, R. E. and J. W. Aldrich. 1951. Ecological studies of breeding bird populations in northern Maine. Ecology 33:226-238.

Kent, T. 1951. The least bitterns of Swan Lake. Iowa Bird Life 21:59-61.

Anthony, A. and D. Foreman. 1951. Observations on the reproductive cycle of the black-tailed prairie dog (CYNOMYS LUDOVICIANUS). Physiol. Zool. 24:242-8.

Hall, E.R. 1951. American Weasels. Univ. Kansas Publication, Museum Natural History, 4:1-466.

Hoyt, J. S. Y., and S. F. Hoyt. 1951. Age records of pileated woodpeckers. Bird-Banding 22:125.

Hitchcock, A.S. 1951. Manual of the grasses of the United States. 2nd edition revised by Agnes Chase. [Reprinted, 1971, in 2 vols., by Dover Publications, Incorporated, New York.]

S51SPRSBNMUS, Legacy reference. Physical copy not yet located.

Vaurie, P. 1951. Six new subspecies of tiger beetles of the genus Cicindela and two corrections (Coleoptera:Cicindelidae). American Museum Novitates no. 1479.

Martin, A.C., H.S. Zim, and A.L. Nelson. 1951. American wildlife and plants: A guide to wildlife food habits. Dover Publications, Inc., New York, NY. 500 pp.

Gould, F.W. 1951. Grasses of the Southwestern United States. University of Arizona Press, Tucson.

Stebbins, R. C. 1951. Amphibians of western North America. University of California Press, Berkeley. 539 pp.

Wood, N. A. 1951. The birds of Michigan. University of Michigan, Ann Arbor, Museum of Zoology Miscellaneous Publication No. 75. 559pp.

Young, S.P. and H.H.T. Jackson. 1951. The clever coyote. Part l. its history, life habits, economic status and control. Part ll. classification of the races of the coyote.Wash. 411 pp.

Martin, A. C., H. S., Zim, and A. L. Nelson. 1951. American Wildlife and Plants, a Guide to Wildlife Food Habits, reprint edition. Dover Publications, Garden City, New York. 500 pp.

Edmunds, G. F., Jr. 1951. New species of Utah mayflies. I. Oligoneuriidae (Ephemeroptera). Proc. Entomol. Soc. Wash. 53: 327-331.

Dement'ev, G. P., N. A. Gladkov, and E. P. Spangenber. 1951. Birds of the Soviet Union. Israel Prog. for Sci. Translations, Russian translation, Jerusalem, Israel.

Gould, F.W. 1951. Grasses of the Southwestern United States. University of Arizona Press, Tucson, Arizona.

Roe, F.G. 1951. The North American Buffalo. A Critical Studyof the Species in the Wild State. Univ. Toronto Press, Toronto. xi+991 pp.

Grasse, J. E. 1951. Beaver ecology and management in the Rockies. Journal of Forestry 49(1):3-6.

Kearney, T.H., R.H. Peebles, and collaborators. 1951. Arizona flora. 2nd edition with Supplement (1960) by J.T. Howell, E. McClintock, and collaborators. Univ. California Press, Berkeley. 1085 pp.

Hecht, W. R. 1951. Nesting of the marsh hawk at Delta, Manitoba. Wilson Bulletin 63:167-76.

Kearney, T.H. and R.H. Peebles. 1951. Arizona flora. University of California Press, Berkeley.

Bartholomew, G. A., and H. H. Caswell. 1951. Locomotion in kangaroo rats and its adaptive significance. Journal of Mammalogy 32:155-169.

Quimby, D.C. 1951. Life history and ecology of the jumping mouse, Zapus hudsonicus. Ecol. Monogr. 21(1):61-95.

Murie, O. J. 1951. The elk of North America. Stackpole Company, Harrisburg, PA. 376 pp.

Davis, J. 1951. Distribution and variation of the brown towhee. Univ. California Publ. Zool., Berkeley.

Buss, I. O. 1951. The upland plover in southwestern Yukon Territory. Arctic 4:204-13.

Ross, H.H. 1951. The Trichoptera of lower California. Proceedings of the California Academy of Sciences 27(3): 65-76.

Robbins, W. W., M. K. Bellue, and W. S. Ball. 1951. Weeds of California. California Dept. Agric., Sacramento.

Hall, E. Raymond. 1951. American weasels. Univ. Kansas Publications, Museum of Natural History. 466 pp.

Eisenmann, E. 1951. Northern birds summering in Panama. Wilson Bull. 63:181-185.

Tordoff, H. B., and G. P. Young. 1951. Short-billed marsh wren breeding in Kansas. Wilson Bulletin 63:44.

Barbour, R. W. 1951. Observations on the breeding habits of the red-eyed towhee. American Midland Naturalist 45:672-678.

Martin, A.C., H.S. Zim, and A.L. Nelson. 1951. American Wildlife and Plants. Dover Publications, Inc., NY.

Hanson, D.F. 1951. Biology of the white crappie in Illinois. Illinois Natural History Survey Bulletin 25(4):211-265.

Byers, E. 1951. Feeding behavior of young American bitterns. Wilson Bulletin. 63:334-6.

Hart, C.M., O.S. Lee, and J.B. Low. 1950. The sharp-tailed grouse in Utah: its life history, status and management. Pub. No. 3, Utah State Department of Fish and Game.

Hershkovitz, P. 1950. Mammals of northern Colombia. Preliminary report no. 6: Rabbits (Leporidae), with notes on the classification and distribution of the South American forms. Proceedings of the United States National Museum 100:327-375.

LaRivers, Ira. 1950. The meeting point of Ambrysus and Pelocoris in Nevada. Pan-Pacific Ent. XXVI(1): pp. 91-21.

Coconino National Forest. 1950. Report on the Establishment of the G.A. Pearson Natural Area. US Forest Service, 19 p.

Allan, P. F. 1950. Scissor-tailed flycatcher, MUSCIVORA FORFICATA, feeding at night. Auk 67:517.

Campbell, H. 1950. Quail picking up lead shot. Journal of Wildlife Management 14:243-244.

Grasse, J. E., and E. F. Putnam. 1950. Beaver management and ecology in Wyoming. Wyoming Game and Fish Commission, Bulletin 6. 52 pp.

Campbell, H. 1950. Note on the behavior of marsh hawks towards lesser prairie chickens. Journal of Wildlife Management 14:477-478.

Chenoweth, W. L. 1950. Records of amphibians and reptiles from New Mexico, Utah, and Arizona. Transactions of the Kansas Academy of Science. 53(4):532-534.

Hoyt, J. S. Y. 1950. Nine years' experience in keeping the pileated woodpecker in captivity. Aviculture 20:41-6.

Fitch, F. W., Jr. 1950. Life history and ecology of the scissor-tailed flycatcher, MUSCIVORA FORFICATA. Auk 67:145-168.

Low, J. B., L. Kay, and D. I. Rasmussen. 1950. Recent observations on the white pelican on Gunnison Island, Great Salt Lake, Utah. Auk 67:345-356.

Heter, E. W. 1950. Transplanting beavers by airplane and parachute. Journal of Wildlife Management 14:143-147.

Miller, R.R. 1950. Notes on the cutthroat and rainbow trouts with the description of a new species from the Gila River, NM. Occas Pap Mus Zool Univ Michigan. 529:1-42.

Correll, D.S. 1950. Native Orchids of North America North of Mexico. Chronica Botanica Company, Waltham, MA. 393 p.

Lowe, C.H. 1950. The systematic status of the salamander Plethodon hardii, with a discussion of biogeographical problems in Aneides, Copeia, no 2, pp 92-99.

Smith, M. W. 1950. The use of poisons to control undesirable fish in Canadian fresh waters. Canadian Fish-Culturist. 8:17-29.

Schroder, R. C. 1950. Hibernation of blue racers and bull snakes in western Illinois. Natural History Miscellany 75:1-2.