Cassel, J.F. 1952. Breeding bird populations at various altitudes in north central Colorado. Ph.D. dissertation. University of Colorado, Boulder, CO. 147 pp.

Allen, R.P. 1952. The Whooping Crane. New York. National Audubon Society Research Report #3. 249 pp.

Miller, N. J. 1952. Carp: control and utilization. Wisconsin Conservation Bulletin. 17(5):3-7.

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.

Dano, L. 1952. Cottontail rabbit (SYLVILAGUS AUDOBONII BAILEYI) populations in relation to prairie dog (CYNOMYS LUDOVICIANUS LUDOVICIANUS ) towns. Colorado State University, Fort Collins, CO. M.S. Thesis.

Carr, A. 1952. Handbook of turtles. Comstock Publishing Associates, Ithaca, New York. 542 pp.

Murray, J. J. 1952. A check-list of the birds of Virginia. Virginia Soc. Ornithol.

Pearson, O.P., M.R. Koford and A.K. Pearson. 1952. Reproduction of the lump-nosed bat (Corynorhinus rafinesquii) in California. J. Mamm. 33:273-320.

George, J.L. 1952. The birds on a southern Michigan farm. Ph.D. dissertation. University of Michigan, Ann Arbor, Michigan. 413 pp.

Reid, K. A. 1952. Effects of beavers on trout waters. Maryland Conserv. 29(4):21-23.

Stewart, P. A. 1952a. Dispersal, breeding behavior, and longevity of banded barn owls in North America. Auk 69:227-45.

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.

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

S51SPRSBNMUS, Legacy reference. Physical copy not yet located.

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.

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

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.

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

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

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.

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.]

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

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.

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.

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

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

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.

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

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

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

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

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.

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.

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

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

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 hudsonius. Ecol. Monogr. 21(1):61-95.

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.

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

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.

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

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.