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

DeBruin, E. 1991. Field survey to Fort Stanton ACEC - Stop #12 27 May, 1991.

Muldavin, E. 1991. Organ Mountains vegetation survey.

Belant, J. L., and R. K. Anderson. 1991. Common loon, GAVIA IMMER, brood habitat use in northern Wisconsin. Can. Field-Nat. 105:372-375.

Collins, J. T. 1991. Viewpoint: a new taxonomic arrangement for some North American amphibians and reptiles. SSAR Herpetol. Review 22:42-43.

Fuller, T. K. 1991. Effect of snow cover on wolf activity and prey selection in north central Minnesota. Canadian J. Zoology 69:283-287.

Johnson, A. S. 1991. Will lobo come home? Defenders 66(1):10-17.

Martin, K., and J. Parker. 1991. Mississippi kites reborn in Tennessee. The Tennesse Conservationist LVII(3):5-10.

Resetarits, W. J., Jr. 1991. Ecological interactions among predators in experimental stream communities. Ecology 72:1782-1793.

Smith, T. S., J. T. Flinders, and D. S. Winn. 1991. A habitat evaluation procedure for Rocky Mountain bighorn sheep in the Intermountain West. Great Basin Nat. 51:205-225.

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.

Davidson, P. W. 1991. East Kootenay bighorn sheep enhancement project: completion report. British Columbia Ministry of Environment. Unpublished Wildlife Branch Report. Cranbrook, BC. 183pp.

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.

Apa, A. D., D. W. Uresk, and R. L. Linder. 1991. Impacts of black-tailed prairie dog rodenticides on nontarget passerines. Great Basin Nat. 51:301-309.

De Smet, K.D., and M.P. Conrad. 1991. Status, habitat requirements, and adaptations of Ferruginous Hawks in Manitoba. Pages 219-221 in G.L. Holroyd, G. Burns, and H.C. Smith, editors. Proceedings of the second endangered species and prairie conservation w

Hines, T. D., and R. M. Case. 1991. Diet, home range, movements and activity periods of swift fox in Nebraska. Prairie Naturalist 23:131-138.

Procter-Gray, E. 1991. Female-like plumage of subadult male American redstarts does not reduce aggression from other males. The Auk 108:872-9.

Strickland, D. 1991. Juvenile dispersal in gray jays: dominant brood member expels siblings from natal territory. Can. J. Zool. 69:2935-2945.

Goldsmith, F.B. 1991. Monitoring for Conservation and Ecology. Chapman and Hall, New York, New York, USA.

Page, L. M., and B. M. Burr. 1991. A field guide to freshwater fishes: North America north of Mexico. Houghton Mifflin Company, Boston, Massachusetts. 432 pp.

Stuart, J. N. 1991. Cnemidophorus exsanguis. Cat. Am. Amph. Rept. 516.1-516.4.

DeBruin, E. 1991. Field survey to Fort Stanton ACEC - Stop #1 22 May, 1991.

DeBruin, E. 1991. Field survey to Farmington Resource Area-Adobe Downs Ranch, stops #12, 13, 14, on 1 May 1991.

Persecetti, C. and J. Horton. 1991. USGS Capitan Peak 7.5' topo map with Astragalus kerrii from 23-31 May 1991 field survey to Capitan Mts for TNC.

Barker, D.G. 1991. An investigation of the natural history of the New Mexico ridgenose rattlesnake, Crotalus willardi obscurus. 100 p.

Flanagan, P. (1991) 1991 Mexican Spotted Owl Inventory Form. Questa Ranger District, Carson National Forest, USFS. 41 p.

Muldavin, E. 1991. Riparian and wetlands survey, Pecos National Historical Park. Natural Heritage New Mexico Publ. No. 91-GTR-26. Natural Heritage New Mexico, Universit of New Mexico, Albuquerque, NM. 31 p.

Locklear, J.H. 1991. The status of Asclepias uncialis green in eastern Co and NE New Mexico. Unpubl report to the Co Field Office of TNC. 55 p + photos + maps.

Sanchez, B. (1991) Formal Spotted Owl Monitoring, Management Territoty 0602007. Silver City Ranger District, Gila National Forest, USFS. 7 p.

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

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

Borth, Robert J. and Thomas S. Barina, 1991. Observations of AMORPHA-feeding CATOCALA in Wisconsin. Journal of the Lepidopterists Society 45(4): 371-372.

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

Cronin, M. A. 1991a. Mitochondrial-DNA phylogeny of deer (Cervidae). J. Mamm. 72:533-566.

Gore, J. A. 1991. Distribution and abundance of nesting least terns and black skimmers in northwest Florida. Florida Field Naturalist 19(3):65-96.

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

Hill, N. P. and J. M. Hagan, III. 1991. Population trends of some northeastern North American landbirds: a half century of data. Wilson Bulletin 103:165-182.

S91SIVTANMUS, Legacy reference. Physical copy not yet located.

Nordyke, K. A., and S. W. Buskirk. 1991. Southern red-backed vole, Clethrionomys gapperi, populations in relation to stand succession and old-growth character in the central Rocky Mountains. Can. Field-Nat. 105:330-334.

Page, G. W., et al. 1991. Distribution and abundance of the snowy plover on its western North American breeding grounds. J. Field Ornithology 62:245-255.

Steidl, R. J., and C. R. Griffin. 1991. Growth and brood reduction of mid-Atlantic coast ospreys. Auk 108:363-370.

Advanced Sciences, Inc. 1991. Threatened and endangered species survey at ABC Flip side, White Sands Missile Range. WSMR Environmental Services Report no. REC-EA-03-88, prepared under WSMR contract DAAD07-90-C-0018. 4 April, 1991. . 14 p.

Hurley, T. Schwarz, H.R. (1991) Northern Goshawk Inventory Form - 1991 . Sandia Ranger District, Cibola National Forest, USFS. 3 p.

Reichenbacher, F.W. 1991. Illustrated manual of rare cacti of the United States and Puerto Rico. Unpublished manuscript draft on Toumeya papyracantha [Pediocactus papyracanthus] for southwest. Field biologists, Univ. of AZ and USFWS. May 1991. 4 pp.

Turner, J. W., Jr., and J. F. Kirkpatrick. 1991. New developments in feral horse contraception and their potential application to wildlife. Wildl. Soc. Bull. 19:350-359.

Anderson, D.L. 1991-1995. Range activities log book. WSMR Environmental Services.

Gorresen, M. Schwarz, H.R. (1991) Northern Goshawk Inventory Form - 1991. Sandia Ranger District, Cibola National Forest, USFS. 4 p.

Malville, L. et al. 1991. Summary report of surveys for Mexican spotted owls (Strix occidentalis lucida) conducted in the San Juan resource area of the Bureau of Land Management in southwestern Colorado

Sivinski, R., and K. Lightfoot. 1991. NM rare plant occurrence record data sheet of 18 June 1991 for Erigeron acomanus. EMNRD, Santa Fe, NM.

Black, C. and J. Black. 1991. Field survey to Gray Ranch - Indian Creek Canyon on 23 June 1991.

DeBruin, E. 1991. Field survey to Fort Stanton ACEC - Stop #36 29 May, 1991.

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

Reed, S. and P. Ryder. 1991. Field survey to Capitan Mts - ridge E. of Ellis Canyon. 23 May 1991.