Newton, I., I. Wyllie, and A. Asher. 1991. Mortality causes in British barn owls TYTO ALBA, with a discussion of aldrin-dieldrin poisoning. Ibis 133:162-169.

Rotenberry, J. T., and J. A. Wiens. 1991. Weather and reproductive variation in shrubsteppe sparrows: a hierarchical analysis. Ecology 72:1325-1335.

Theberge, J. B. 1991. Ecological classification, status, and management of the gray wolf, Canis lupus, in Canada. Canadian Field-Naturalist 105:459-463.

Anderson, D.L. 1991. Plant collection log sheet for ^&Talinum longipes - log #41: Mockingbird Gap. 25 July 1991.

Fisher, R.E. 1991. Notes from phone conversation with Margaret Estabrook of the Reserve Ranger District, Gila National Forest on 7 Oct 1991.

Madrid, R. (1991) 1991 Mexican Spotted Owl Daytime Follow-up Visit Forms. Silver City Ranger District, Gila National Forest, USFS. 6 p.

Snow, P. Herrera, D. Miller, S. Ocana, P. 1991. 1990 Mexican Spotted Owl Inventory Form, El Rito Ranger District, Carson National Forest. USFS.

Unknown (1991) 1991 Humbolt Demographic Study Sighting. Retrieved from silver City Ranger Distict, Gila National Forest, USFS. 3 p.

Beier, P. 1991. Cougar attacks on humans in the United States and Canada. Wildl. Soc. Bull. 19:

Dennis, B., P. L. Munholland, and J. M. Scott. 1991. Estimation of growth and extinction parameters for endangered species. Ecological Monographs 61:115-143.

Hamer, D., S. Herrero, and K. Brady. 1991. Food and habitat used by grizzly bears, Ursus arctos, along the Continental Divide in Waterton Lakes National Park, Alberta. Canadian Field-Naturalist 105:325-329.

Kozie, K. D., and R. K. Anderson. 1991. Productivity, diet, and environmental contaminants in bald eagles nesting near the Wisconsin shoreline of Lake Superior. Arch. Environ. Contam. Toxicol. 20:41-48.

Pekins, P. J., F. G. Lindzey, and J. A. Gessaman. 1991. Physical characteristics of blue grouse winter use-trees and roost sites. Great Basin Nat. 51:244-248.

Smith, H. M., G. A. Hammerson, J. J. Roth, and D. Chizar. 1991. Distributional addenda for the smooth green snake (Opheodrys vernalis) in western Colorado, and the status of its subspecies. Bull. Maryland Herp. Soc. 27(2):99-106.

Avise, J. C., C. D. Ankney, and W. S. Nelson. 1991. Mitochondrial gene trees and the evolutionary relationship of mallard and black ducks. Evolution 44:1109-1119.

Burger, J., and R. T. Zappalorti. 1991. Nesting behavior of pine snakes (Pituophis m. melanoleucus) in the New Jersey Pine Barrens. J. Herpetol. 25:152-160.

Garrott, R. A. 1991b. Sex ratios and differential survival of feral horses. J. Anim. Ecol. 60:929-937.

Johnson, F. A., et al. 1991. Distribution, abundance, and habitat use by mottled ducks in Florida. J. Wildl. Manage. 55:476-482.

Nehlsen, W., J. E. Williams, and J. A. Lichatowich. 1991. Pacific salmon at the crossroads: stocks at risk from California, Oregon, Idaho, and Washington. Fisheries 16(2):4-21.

Rosen, P. C. 1991. Comparative ecology and life history of the racer (Coluber constrictor) in Michigan. Copeia 1991:897-909.

Walker, J. M., et al. 1991. Activity, temperature, age, size and reproduction in the parthenogenetic whiptail lizard Cnemidophorus dixoni in the Chinati Mountains in Trans-Pecos Texas. Am. Midl. Nat. 126:256-268.

Pianka, E. R. 1991. Phrynosoma platyrhinos. Catalog of American Amphibians and Reptiles 517: 1-4.

Clayton, P. 1991. Field survey to Ball Ranch - Stop #13 on 23 July 1991.

DeBruin, E. 1991. Field survey to Fort Stanton ACEC - Stop #41 28 May, 1991.

DeBruin, E. 1991. Field survey to Farmington Resource Area- ACEC Area #13 on 25 April 1991.

Britton, B. 1991. Unpublished plant element occurrence record for Allium gooddingii in BS Canyon, Sept. 1988. + map.

Henry, A. 1991. Unpub. letter to Pat Mehlhop regarding Aplomado Falcon sightings on the Gray Ranch. February 15, 1991.

Painter, C.W. 1991. Letter from Charlie Painter, Endangered Species biologist for NM Dept. Game and Fish to Pat Mehlhop of NMNHP dated 4 Sept. 1991 regarding Sceloporus scalaris localities in Hidalgo Co. 1 pp.

Sullivan, R.M. 1991. Live trapping of potential habitat for the meadow jumping mouse (Zapus hudsonius luteus) at the San Jose drain outfall area. Preliminary environmental report submitted to the Marron/Taschek/Knight Corporation.

Clayton, P. 1991. Field survey to Ball Ranch - Stop #15 on 29 July 1991.

Albuja, L. 1991. Lista de vertebrados del Ecuador. Escuela Politécnica XVI:163-203.

DeBruin, E. 1991. Field survey to Fort Stanton ACEC - Stop #9 23 May, 1991.

Burger, J., and M. Gochfeld. 1991. Human activity influence and diurnal and nocturnal foraging of sanderlings (CALIDRIS ALBA). Condor 93:259-265.

DeBruin, E. 1991. Field survey to Farmington Resource Area- ACEC Area #12 on 25 April 1991.

Echelle, A. A. 1991. Conservation genetics and genic diversity in freshwater fishes of western North America. Pages 141-153 in W. L. Minckley and J. E. Deacon, eds. Battle against extinction: native fish management in the American West. University of Ariz

Stoltz, J., and J. Schnell (eds.). 1991. Trout: The Wildlife Series. Stackpole Books, Harrisburg, Pennsylvania. 384 pp.

Knight, P.J., and A.C. Cully. 1991. A new species of Astragalus (Fabaceae) from southeastern New Mexico. Southwestern Naturalist 36(2): 198-200.

Mattson, D. J., and M. M. Reid. 1991. Conservation of the Yellowstone grizzly bear. Conservation Biology 5(3):364-372.

Anderson, J. (1991) Map of Red Canyon MSO Survey # 2. Sandia Ranger District, Cibola National Forest, USFS. 2 p.

Quinn, T. W., G. F. Shields, and A. C. Wilson. 1991. Affinities of the Hawaiian goose based on two types of mitochondrial DNA data. Auk 108:585-593.

DeBow, M.J. 1991. Letter to Jennifer Fowler-Propst of US Fish and Wildlife Service concerning discovery of two Pediocactus papracanthus. 16 Oct 1991.

Mills, Scott G. 1991. Miscellaneous notes on Coryphantha scheeri robustrispina. United States Forest Service (USFS) Regional Office, Albuquerque, NM. p.30.

The Nature Conservancy. Dec 9 1991. Addendum: Site Prospectus: Natural Land Protection Act, site identification program, presented to Natural Lands Protection Committee.

Zink, R. K., et al. 1991a. Mitochondrial DNA variation and the taxonomic status of the large-billed savannah sparrow. Condor 93:1016-1019.

Gibbons, J. W., and R. D. Semlitsch. 1991. Guide to the reptiles and amphibians of the Savannah River Site. Univ. of Georgia Press, Athens. xii + 131 pp.

Brozka, R.J. 1991. Progress report, 1988-1990: Land Condition-Trend Analysis Program, White Sands Missile Range, New Mexico. Prepared by U.S. Army Corps of Engineers, Construction Engineering Research Laboratory, Environmental Division. October 1991.

Howard, M. 1991. Sensitive threatened and endangered plant data form. May 8, 1991.

Paul, L. (1991) Unpublished Letter to Forest Supervisor, Subject: Peregrine Falcon Eyrie (Code Name Agua Dulce). Lincoln Supervisor's Office, Lincoln National Forest, USFS. 3 p.

Clayton, P. 1991. Field survey to Ball Ranch - Stop #24 on 6 Aug 1991.

DeBruin, E. 1991. Field survey to Farmington Resource Area-east fork Kutz Canyon-stop #13 on 7 May 1991.

DeBruin, E. 1991. Field survey to Farmington Resource Area - Tucker Canyon plot #8 on 1 May 1991.

USDA-FS. 1991. Forest Service map of Gila National Forest with EO and survey locations of Allium gooddingii. From Margaret Estabrook of Reserve Ranger District, Gila N.F.

DeBruin, E. Sept 1991. Special plant site survey form for Oenthothera organensis.

DeBruin, E. 1991. Field survey to Farmington Resource Area-plot #23 on 8 May 1991.

DeBruin, E. 1991. Field survey to Farmington Resource Area - Aztec plot #7 on 25 April 1991.

Bull, E. L. and H. D. Cooper. 1991. Vaux's Swift nests in hollow trees. Western Birds 22:85-91.

Day, K. S., L. D. Flake, and W. L. Tucker. 1991. Characteristics of wild turkey nest sites in a mixed-grass prairie--oak-woodland mosaic in the northern great plains, South Dakota. Can. J. Zool. 69:2840-2845.

George, T.L., and L.C. McEwen. 1991. Relationships between bird density, vegetation characteristics, and grasshopper density in mixed-grass prairie of western North Dakota. Pages 465-475 in D.R. McCullough and R.H. Barrett, editors. Wildlife 2001: populat

Mahall, B.E. and R.M. Callaway. 1991. Root communication among desert shrubs. Ecology. 88:874-876.

Anderson, J. (1991) Map of Ox Canyon MSO Survey #2. Sandia Ranger District, Cibola National Forest, USFS. 1 p.