Smith, D.G. 1991. Keys to the Freshwater Macroinvertebrates of Massachusetts. D.G. Smith, Amherst, Massachusetts. 236 pp.

Kingsley, N.P., and T.H. Nicholls. 1991. Raptor habitat in the midwest. Pages 185-194 in Proc. midwest raptor management symposium and workshop. National Wildlife Federation, Washington, DC.

Marsh, P.C., M.E. Douglas, W.L. Minckley and R. Timmons. 1991. Rediscovery of Colorado squawfish, Ptychocheilus lucius (Cyprinidae), in Wyoming. Copeia 1991:1091-1092.

Propst, D. L., and K. R. Bestgen. 1991. Habitat and biology of the loach minnow, Tiaroga cobitis, in New Mexico. Copeia 1991:29-38.

Cadman, M. D. 1991. Updated status report on the Loggerhead Shrike (eastern population) LANIUS LUDOVICIANUS MIGRANS, in Canada. Committee on the Status of Endangered Wildlife in Canada (COSEWIC). 26 pp.

Mahrt, M. and J.R. Bacon. 1991. Inventory of listed species joint task force six operations Luna, Dona Ana, and Hidalgo counties, New Mexico. Unpub. report for U.S. Army Corp of Engineers, Albuquerque district and Joint Task Force Six, Fort Bliss, TX.

Southwestern Field Biologists. 1991. August 12, 1991 inventory of Mexican Spotted Owl ( Strix occidentalis lucida Nelson) in the Gila NF, Wilderness District.

Youngman, P. M., and F. W. Schueler. 1991. Martes nobilis is a synonym of Martes americana, not an extinct Pleistocene-Holocene species. J. Mamm. 72:567-577.

Cockrum, E. L., and Y. Petryszyn. 1991. The long-nosed bat, Leptonycteris: an endangered species in the southwest? Occas. Pap. Mus. Texas Tech Univ. (142):1-32.

Black, C. 1991. Bird observations on the Gray Ranch, Hidalgo Co., New Mexico. Compiled for the Nature Conservancy. 10 p.

Hevron, B. Oct 1 1991. Results of survey for: Erigeron acomanus, Proatriplex pleiantha and monitoring study of Astragalus humillimus on the Navajo Nation. Unpublished report for EMNRD by Navajo Natural Heritage Program.

Paton, P. W. C., and T. C. Edwards, Jr. 1991. Nesting ecology of the snowy plover at Great Salt Lake, Utah--1991 breeding season. Progress Report, Contract No. 90-2028, Utah Cooperative Fish and Wildlife Research Unit, Utah State University, Logan. 28 pp.

Weizling, R. 1991. Known site monitoring form for Ipomopsis sancti-spiritus. 6 p.

Clayton, P. 1991. Field survey to Ball Ranch - Stop #11 on 23 July 1991.

DeBruin, E. 1991. Field survey to Farmington Resource Area-Kutz Canyon-stop #6A on 24 April 1991.

Black, C. and J. Black. 1991. Field survey to Gray Ranch - Animas Peak NE - site #1 on 23 June 1991.

Reed, S. and P. Hyder 1991. USGS San Patricio 7.5' topo map with Mammillaria heyderii from 22 May 1991 field survey for TNC.

DeBruin, E. Sept 1991. Special plant survey form, NM for Coryphantha organensis in the Organ Mts.

DeBruin, E. 1991. Field survey to Farmington Resource Area-Armenta Canyon, stop #1 on 24 April 1991.

DeBruin, E. 1991. Field survey to Farmington Resource Area - Hampton Arroyo ACEC plot #18 on 6 May 1991.

Gerhardt, R. P., M. A. Vasquez, and D. M. Gerhardt. 1991. Breeding biology, food habits, and siblicide of swallow-tailed kites. Pages 65-71 in Maya Project, Progress Report 4 (D. F. Whitacre, W. A. Burham, and J. P. Jenny, eds.). The Peregrine Fund, Boise

Bull, E. L. 1991. Summer roosts and roosting behavior of Vaux's Swifts in old-growth forests. Northwestern Naturalist 72:78-82.

Dawson, J. W., and R. W. Mannan. 1991b. The role of territoriality in the social organization of Harris' hawks. Auk 108:661-672.

Geist, V. 1991. Phantom subspecies: the wood bison BISON BISON "ATHABASCAE" Rhoades 1897 is not a valid taxon, but an ecotype. Arctic 44:283-300.

Leachman, B. and F. Knopf. 1991. Mountain plover gets attention. Fish and Wildlife News, June-July-August 1991, pp. 15, 22.

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.

Garrott, R. A., D. B. Siniff, and L. L. Eberhardt. 1991b. Growth rates of feral horse populations. J. Wildl. Manage. 55:641-648.

Jhala, Y. V., and R. H. Giles, Jr. 1991. The status and conservation of the wolf in Gujarat and Rajasthan, India. Conservation Biology 5(4):476-483.

Mitchell, J. C. 1991. Amphibians and reptiles. Pages 411-76 in K. Terwilliger (coordinator). Virginia's Endangered Species: Proceedings of a Symposium. McDonald and Woodward Publishing Company, Blacksburg, Virginia.

Ridgway, M. S., B. J. Shuter, and E. E. Post. 1991b. The relative influence of body size and territorial behaviour on nesting asynchrony in male smallmouth bass, Micropterus dolomieui (Pisces: Centrarchidae). Journal of Animal Ecology 60:665-681.

Van Sickle, W. D., and F. G. Lindzey. 1991. Evaluation of a cougar population estimator based on probability sampling. J. Wildl. Manage. 55:738-743.

Ownbey, G. B., and T. Morley. 1991. Vascular plants of Minnesota: A checklist and atlas. University of Minnesota Press, Minneapolis.

Clayton, P. 1991. Field survey to Ball Ranch - Stop #14 on 29 July 1991.

DeBruin, E. 1991. Field survey to Fort Stanton ACEC - Stop #37 30 May, 1991

DeBruin, E. 1991. Field survey to Farmington Resource Area- Kutz Canyon, stop #7 on 9 May 1991.

Tobalske, B.W., R.C. Shearer, and R.L. Hutto. 1991. Bird populations in logged and unlogged western larch/Douglas-fir forest in northwestern Montana. USDA Forest Service Intermountain Research Station Research Paper INT-422.

Advanced Sciences, Inc. 1991. Threatened and endangered species survey for road grades and site preparation at Multiple Launch Rocket System (MLRS)/Multi-mode Automatic Tracking System (MATS) at White Sands Missile Range, final report. Report no. REC-0199

Hakkila, M. 1991. Unpub letter to Pat Mehlhop on Rana spp. Localities dated 3 Dec 1991. 1 p + 2 maps.

New Mexico Dept of Game and Fish. 1991. New Mexico fish specimen database. Unpub printout from NM Dept Game and Fish database on specimens of Gila nigrescens at various museums. 2 pp.

Smartt, R. 1991. Species report on snails from New Mexico in UTEP museum specimen holdings. Unpublished listing of snail specimens at UTEP. 14 pp.

Sirotnak, J. M., K. P. Reese, J. W. Connelly, and K. Radford. 1991. Effects of the Conservation Reserve Program (CRP) on wildlife in southeastern Idaho. Idaho Department of Fish and Game Job Compl. Rep., Proj. W-160-R-18.

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