Garrott, R. A., T. C. Eagle, and E. D. Plotka. 1991a. Age-specific reproduction in feral horses. Can. J. Zool. 69:738-743.

Jackson, G. D. 1991. Field identification of teal in North America: female-like plumages. Part I: blue-winged, cinnamon, and green-winged teal. Birding 23(3):124-133.

Mayer, P. M., and M. R. Ryan. 1991b. Electric fences reduce mammalian predation on piping plover nests and chicks. Wildlife Society Bull. 19:59-63.

Reichel, J. D., and P. O. Glass. 1991. Checklist of the birds of the Mariana Islands. Elepaio 50:3-11.

Tyus, H. M. 1991. Ecology and management of the Colorado squawfish. Pages 379-402 in W. L. Minckley and J. E. Deacon, editors. Battle against extinction: native fish management in the American West. Univ. Arizona Press, Tucson.

Altenbach, J. Scott. 1991. Untitled letter about "Lava Cave." Department of Biology, University of New Mexico. October 1991. 2 pp.

Mehlhop, P., et al. 1991. Status and distribution of Erigeron rhizomatus (Zuni Fleabane) within a designated satellite image reflectance value in the Datil and Sawtooth Mts. Unpubl. report by New Mexico Natural Heritage Program for Cibola National Forest.

Sivinski, R. 1991. Letter to Douglas F. Irving of Chapman, Wood, and Griswold, Inc. Concerning proposed mining impact on Townsendia gypsophila occurring in Sec. 16, T15NR1E.

Clayton, P. 1991. Field survey to Ball Ranch - Stop #16 on 30 July 1991.

Buehler, D. A., et al. 1991a. Differences in distribution of breeding, nonbreeding, and migrant bald eagles on the northern Chesapeake Bay. Condor 93:399-408.

DeBruin, E. 1991. Field survey to Fort Stanton ACEC - Stop #2 23 May, 1991.

Dickerman, R. W. 1991. On the validity of BUBO VIRGINIANUS OCCIDENTALIS Stone. Auk 108:964-965.

Burger, J., and M. Gochfeld. 1991. The common tern: its breeding biology and social behavior. Columbia Univ. Press, New York. 413 pp.

DeBruin, E. 1991. Field survey to Farmington Resource Area-plot #2 on 22 April 1991.

Peterjohn, B.G., and D.L. Rice. 1991. Ohio breeding bird atlas. Ohio Department of Natural Resources, Division of Natural Areas and Preserves, Columbus, Ohio. 416 pp.

Mehlhop, P. 1991. Land snail field survey in New Mexico to Organ Mts, Soledad and North Canyons, Sept 9, 1991.

Johnson, R. K., R. R. Roth, S. E. Kleiner, and C. R. Bartlett. 1991. A case of polygyny in the Wood Thrush. The Wilson Bulletin 103:509-10.

Manuwal, D. A. 1991. Spring bird communities in the southern Washington Cascade Range. Pages 161-174 IN L. F. Ruggiero, K. B. Aubry, A. B. Carey, and M. H. Huff, technical coordinators. Wildlife and Vegetation of unmanaged Douglas-fir Forests. USDA Forest

Prescott, D. R. C. 1991. Winter distribution of age and sex classes in an irruptive migrant, the evening grosbeak (COCCOTHRAUSTES VESPERTINUS). Condor 93:694-700.

Bravo-Hollis, H. y H. Sanchez-Mejorada. 1991. Las Cactaceas de MUniversidad Nacional Autonoma de MMVol. II Y III.

Kartesz, J. T. 1991. Accepted taxon names from 1991 checklist, as extracted by Larry Morse, TNC, June 1991.

Winston, M. R., C. M. Taylor, and J. Pigg. 1991. Upstream extirpation of four minnow species due to damming of a prairie stream. Transactions of the American Fisheries Society 120:98-105.

Sivinski, R. 1991. Status report on Sophora gypsophila var. guadalupensis. NM Dept. of Energy, Minerals, and Natural Resources, Forestry Division.

Belk, M. C., and H. D. Smith. 1991. Ammospermophilus leucurus. Am. Soc. Mamm., Mammalian Species No. 368:1-8.

Clayton, P. 1991. Field survey to Ball Ranch - Stop #3 on 19 July 1991.

DeBruin, E. 1991. Field survey to Farmington Resource Area-plot #15 on 4 May 1991.

Ashton, R. E., Jr., and P. S. Ashton. 1991. Handbook of reptiles and amphibians of Florida. Part two. Lizards, turtles & crocodilians. Revised second edition. Windward Pub., Inc., Miami. 191 pp.

Spahr, R., L. Armstrong, D. Atwood, and M. Rath. 1991. Threatened, endangered, and sensitive species of the Intermountain Region. U.S. Forest Service, Ogden, Utah.

DeBruin, E. 1991. Field survey to Farmington Resource Area-Flora Vista, stop #3 on 23 April 1991.

New Mexico Natural Heritage Program. 1991. Field map for 1991 Gilia formosa survey on USGS 7 1/2' topo map, Cedar Hill quad.

DeBruin, E. 1991. Field survey to Farmington Resource Area- Aztec- stop #11 on 22 April 1991.

DeBruin, E. 1991. Field survey to Farmington Resource Area - Tucker Canyon plot #9 on 1 May 1991.

DeBruin, E. 1991. Field survey to Fort Stanton ACEC - Stop #6A, 27 May, 1991

Brennan, L. A. 1991. How can we reverse the northern bobwhite population decline? Wildl. Soc. Bull. 19:544-555.

DeBruin, E. 1991. Field survey to Farmington Resource Area - Tucker Canyon stop #4 on 1 May 1991.

Dawson, J. W., and R. W. Mannan. 1991a. Dominance hierarchies and helper contributions in Harris' hawks. Auk 108:649-660.

Laycock, W.A. 1991. Stable states and thresholds of range condition on North American rangelands: a viewpoint. Journal of Range Management. 44(5):427-433.

Nesom, G. L. 1991. A new species of Erigeron (Asteraceae: Asterae) from Northwestern New Mexico. Phytologia 71(5): 416-419.

Rogers, M. A. 1991b. Evolutionary differentiation within the northern Great Basin pocket gopher, Thomomys townsendii. II. Genetic variation and biogeographic considerations. Great Basin Nat. 51:127-152.

Taylor, W. K., and M. A. Kershner. 1991. Breeding biology of the great crested flycatcher in central Florida. J. Field Ornithol. 62:28-39.

ECoPlan Inc. 1991? An analysis of wetlands and endangered plant species along the Chama River: and their responses to fluctuating water levels. Part of study of Chama Wild and Scenic River w/ USFS and other agencies.

Kirkeminde, M. 1991. Letter regarding recent visits to existing Allium gooddingii locations in the Gila National Forest dated 2 Jan 1992. 3 pp.

Skaggs, K. 1991. Personal communication to Ellen DeBruin Regarding Oenothera Organensis.

Aldrich, J. W., and F. C. James. 1991. Ecogeographic variation in the American robin. Auk 108:230-249.

Confer, J.L., K. Knapp, D. Coker, M. Armstrong, and J. Doherty. 1991. The rapidly changing distribution of the Golden-winged Warber (VERMIVORA CHRYSOPTERA) in central New York. Kingbird 41:5-10.

Grzybowski, J. A. 1991. A closer look: the black-capped vireo. Birding, August 1991, pp. 216-219.

Keast, A., and S. Saunders. 1991. Ecomorphology of the North American ruby-crowned (REGULUS CALENDULA) and golden-crowned (R. SATRAPA) kinglets. Auk 108:880-888.

Oldham, J.C. and H.M. Smith. 1991. The generic status of the smooth green snake, Opheodrys vernalis. Bull. Md. Herp. Soc. 27(4):201-215.

Scott, A. C., and M. Bekoff. 1991. Breeding behavior of evening grosbeaks. Condor 93:71-81.

Daly, L., S. Hoffman. 1991. Final Reports: Inventory for Northern Goshawk (Accipiter gentilis) in the Gila National Forest. Reserve District. June 27 to July 12, 1991. Prepared for U.S.F.S.

Kirkeminde, M. 1991. Unpub field notes for survey to Mogollon Mts - Indian Creek on 10 July 1991. 1 p + map.

Robertson, M.D. 1991. Winter ecology of migratory sage grouse and associated effects of prescribed fire in southeastern Idaho. M.S. Thesis, University of Idaho, Moscow. 88 pp.

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.

Anderson, J. (1991) 1991 Mexican Spotted Owl Inventory Form. Sandia Ranger District, Cibola National Forest, USFS. 2 p.

Gila National Forest. 1991. Mexican Spotted Owl inventory forms.

Meints, D.R. 1991. Seasonal movements, habitat use and productivity of Columbian sharp-tailed grouse in southeastern Idaho. M.S. thesis, University of Idaho. 74 pp.