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.

Clark, J. D., and K. G. Smith, editors. 1991. Proceedings of the eastern workshop on black bear research and management. Univ. Arkansas. 150 pp.

van Rhijn, J. G. 1991. The ruff. Academic Press, San Diego, California. xii + 209 pp.

DeBruin, E. 1991. Field survey to Gila National Forest, Grouse Mountain - Stop #1 on 20 July 1991.

DeBruin, E. 1991. Field survey to Farmington Resource Area-plot #16 on 4 May 1991.

Muldavin, E. 1991. Gray Ranch vegetation survey, 1991. New Mexico Natural Heritage Program

Bureau of Land Management. 1991. Maps of USGS 7.5' top maps with transparencies showing Gilia formosa: existing pops, areas surveyed and potential distribution. Prepared from Paul Knight's 1986 field work maps.

Figg, D. E. 1991. Missouri Department of Conservation Annual Nongame and Endangered Species Report July 1990 - June 1991. ii + 35 pp.

Knapp, M. 1991.Unpublished letter to Camino Real District Ranger, Subject: Alamo Dinner Diversity Unit. USFS.

Sanchez, B. (1991) Formal Spotted Owl Monitoring, Management Territory 0602003, Summar of 1991 Monitoring. Silver City Ranger District, Gila National Forest, USFS. 5 p.

Aguero, D. A., R. J. Johnson, and K. M. Eskridge. 1991. Monofilament lines repel house sparrows from feeding sites. Wildl. Soc. Bull. 19:416-422.

Buhlmann, K. A., and M. R. Vaughan. 1991. Ecology of the turtle Pseudemys concinna in the New River, West Virginia. Journal of Herpetology 25:72-78.

DeBruin, E. 1991. Special plant survey form, New Mexico for Draba standleyi.

Dunbar, D. L., et al. 1991. Status of the spotted owl, STRIX OCCIDENTALIS, and barred owl, STRIX VARIA, in southwestern British Columbia. Canadian Field-Naturalist 106:464-468.

American Ornithologists' Union (AOU) . 1991. Thirty-eighth Supplement to the American Ornithologists' Union Check-list of North American Birds. Auk 108:750-754.

DeBruin, E. 1991. Field survey to Fort Stanton ACEC - Stop #13 27 May, 1991.

Margules, C.R. and M.P. Austin. Eds. 1991. Nature conservation: cost effective biological surveys and data analysis. Csiro, Australia.

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.

Advanced Sciences, Inc. 1991. Final report: threatened and endangered species survey of areas to be affected by relocation of the Woodbridge EMP Simulator Facilities to WSMR. WSMR Environmental Services. 23 December 1991. . 33 p.

Harper, J. 1991. Mexican Spotted Owl Annual Report- FY 91. Jicarilla Ranger District, Carson National Forest, USFS. 4 p.

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.

Poague, L. 1991. Monitoring Report for Hedghog Cactus. United States Forest Service (USFS) Regional Office, Albuquerque, NM. p.16.

Worthington, R.D. 1991. Rare plant survey of the Limestone Hills east of nations east well and west of Hueco Tanks State Historical Park, Fort Bliss Military Reservation, El Paso County, Texas. Unpubl. report by New Mexico Natural Heritage Program for Ft.

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.

Tate, G.R. 1991. Population dynamics, reproductive ecology, and conservation of two insular populations of the short-eared owl in Massachusetts. University of Massachusetts, Boston, Massachusetts. M.S. thesis. 107 pp.

DeBruin, E. 1991. Survey for Echinocereus fendleri ver. kuenzleri on Fort Stanton Reservation. Unpubl. report by New Mexico Natural Heritage Program for BLM Roswell Resource Area. 12 p. + app.

Lincoln National Forest, Mayhill Ranger District. 1991. Echinocereus fendleri var kuenzleri monitoring report, March 1991.

Schwarz, H. Hurley, T. (1991) Northern Goshawk Inventory Form - 1991. Sandia Ranger District, Cibola National Forest, USFS. 5 p.

Black, C. and J. Black. 1991. Field survey to Gray Ranch - Indian Creek Canyon on 24 June 1991.

DeBruin, E. 1991. Field survey to Fort Stanton ACEC - Stop #34 29 May, 1991.

Horton, J. and C. Persichetty. 1991. Field survey to Capitan Mts. - Pierce Canyon Arroyo at Forest Rd. 57, 23 May 1991.

Muldavin, E. 1991. Organ Mountains vegetation survey, 1991. New Mexico Natural Heritage Program

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

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.

Perry, J. P. 1991. The Pines of Mexico and Central America. Timber Press.

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.

Newton, I., I. Wyllie, and A. Asher. 1991. Mortality causes in British Barn Owls Tyto alba with a discussion of aldrin-diedrin poisoning. Ibis 133: 162-169.

Russell, R. W., et al. 1991. A visual study of migrating owls at Cape May Point, New Jersey. Condor 93:55-61.

Thompson, D. B., J. H. Brown, and W. D. Spencer. 1991. Indirect facilitation of granivorous birds by desert rodents: experimental evidence from foraging patterns. Ecology 72(3):852-683.

Dunmire, W. 1991. Observation of threatened and endangered plants - survey report form of the Bureau of Land Management.

Hurley, T. Gorresen, M. (1991) Northern Goshawk Inventory Form - 1991 . Sandia Ranger District, Cibola National Forest, USFS.

Sivinski, R. and K. Lightfoot. 1991. NM Rare Plant Occurrence record data sheet of 10 July 1991 for Trifolium neurophyllum. EMNRD, Santa Fe.

Burgner, R. L. 1991. Life history of sockeye salmon (Oncorhynchus nerka). Pages 1-117 in C. Groot and L. Margolis, editors. Pacific salmon life histories. University of British Columbia Press, University of British Columbia, Vancouver. xv + 564 pp.

Forbes, S. H., and F. W. Allendorf. 1991b. Associations between mitochondrial and nuclear genotypes in cutthroat trout hybrid swarms. Evolution 45:1332-1349.

Johnson, N. K., and J. A. Marten. 1991. Evolutionary genetics of flycatchers. III. Variation in EMPIDONAX HAMMONDII (Aves: Typrannidae). Can. J. Zool. 69:232-238.

Murphy, E. C., A. M. Springer, and D. G. Roseneau. 1991. High annual variability in reproductive success of kittiwakes (Rissa tridactyla L.) at a colony in western Alaska. Journal of Animal Ecology 60:515-534.

Sakai, H. F., and B. R. Noon. 1991. Nest-site characteristics of Hammond's and Pacific-slope flycatchers in northwestern California. Condor 93:563-574.

Zink, R. K., and D. L. Dittman. 1991. Evolution of brown towhees: mitochondrial DNA evidence. Condor 93:98-105.

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.