Darling, L., and R. Archibald, editors. 1990. Bears--their biology and management. Proc. Eighth Int. Conf. on Bear Res. and Manage., Victoria, British Columbia, Feb. 1989. 438 pp.

Castetter, R. 1990. Field survey to Gray Ranch-Deer Creek on 6 July 1990.

Muldavin, E. 1990. Community field survey to the Organ Mountains, Sept. 4, 1990 to Sept. 28, 1990.

Chapman, R. W. 1990. Mitochondrial DNA analysis of striped bass populations in Chesapeake Bay. Copeia 1990:355-366.

Dulin, G. S. 1990. 1990 Summary Report of the Forster's and black tern breeding survey of the Minnesota Valley National Wildlife Refuge and Vicinity. unpublished report to the Minnesota Valley National Wildlife Refuge and the Minnesota Nongame Wildlife Pr

Ham, J. C., and P. N. Lehner. 1990. Notes on gray jay demographics in Colorado. Wilson Bull. 102:698-702.

Orr, M. V. 1990. Data sheet of independent survey of Pediocactus papyracanthus with map.

Nicholls, J. L., and G. A. Baldassarre. 1990. Habitat associations of piping plovers wintering in the United States. Wilson Bull. 102:581-590.

Mehlhop, P. 1990. Field survey to Gray Ranch - S. Animas Valley and Playas Valley of August 18, 1990.

Shields, M. A., and J. F. Parnell. 1990. Marsh nesting by American oystercatchers in North Carolina. J. Field Ornithol. 61:431-433.

Young, B. E., M. Kaspari, and T. E. Martin. 1990. Species-specific nest site selection by birds in ant-acacia trees. Biotropica 22:310-315.

Sibley, C. G., and J. E. Ahlquist. 1990. Phylogeny and classification of birds: a study in molecular evolution. Yale Univ. Press, New Haven. xxiii + 976 pp.

Daly, L. Parker, M. (1990) 1190 Mexican Spotted Owl Inventory Form. Sandia Ranger District, Cibola National Forest, USFS. 20 p.

Lincoln National Forest. 1990. Mexican Spotted Owl inventory forms.

Advanced Sciences, Inc. 1990. Threatened and endangered species survey at the ABC-1 Tank Impact Area. WSMR Environmental Services Report no. EA-03-88, prepared under WSMR Contract DAAD07-90-C-0018, Work Assignment Order 200-11. 5 October 1990. . 13 p.

Museum of Southwest Biology. 1990. Unpublished listing of mammal species specimens from Hidalgo County at MSB. Database print-out.

Wessman, L. 1990. Survey trip for Astragalus kerrii. Unpub. letter and map to USFS, Cloudcroft Ranger District, Forest Threatened and Endangered Plant Coordinator, John Connors, on 18 May 1990. 2 pp. + map.

Conway, C. J. 1990. Seasonal changes in movements and habitat use by three sympatric species of rails. M.Sc.thesis, University of Wyoming, Laramie.

Dijak, W. D., B. Tannenbaum, and M. A. Parker. 1990. Nest-site characteristics affecting success and reuse of red-shouldered hawk nests. Wilson Bull. 102:480-486.

Houston, C. S. 1990. Saskatchewan Swainson's hawks. Am. Birds 44:215-220.

Pattee, O. H., et al. 1990. Lead hazards within the range of the California condor. Condor 92:931-937.

Castetter, R. 1990. Xeroxed portion of 7.5' USGS topo map from Rick Castetter with location of spotted owl and 1 young seen. 22 June 1979.

Solis, D. M., Jr., and R. J. Gutierrez. 1990. Summer habitat ecology of northern spotted owls in northwestern California. Condor 92:739-748.

Gila National Forest. 1990. Mexican Spotted Owl daytime follow-up visit forms, survey for Mexican Spotted Owl.

Scott, N.J. 1990. Rana chiricahuensis database. Unpub MSB database printout of R. chiricahuensis specimens from NM at various museums. 70+ pp.

Apa, A. D., D. W. Uresk, and R. L. Linder. 1990. Black-tailed prairie dog populations one year after treatment with rodenticides. Great Basin Nat. 50:107-113.

Bucher, E. H. 1990. The influence of changes in regional land-use patterns on ZENAIDA dove populations. Pages 291-303 in J. Pinowski and J. D. Summers-Smith, editors. Granivorous birds in the agricultural landscape. Polish Scientific Publisher, Warszawa.

Frazer, C., J. R. Longcore, and D. G. McAuley. 1990a. Habitat use by postfledging American black ducks in Maine and New Brunswick. Journal of Wildlife Management 54:451-459.

Johnson, G., and R. E. Chambers. 1990. Response to conspecific, roadside playback recordings: an index of red-shouldered hawk breeding density. Pages 71-76 in Mitchell et al., eds. Ecosystem management: rare species and significant habitats. New York Stat

Lee, D. S., and W. R. Spofford. 1990. Nesting of golden eagles in the central and southern Appalachians. Wilson Bull. 102:693-698.

Ritchison, G., and M. K. Omer. 1990. Winter behavior of Northern Cardinals (CARDINALIS CARDINALIS). Transactions of the Kentucky Academy of Science 51:145-153.

Wiens, J. A., and B. Van Horne. 1990. Comparisons of the behavior of sage and Brewer's sparrows in shrubsteppe habitats. Condor 92:264-266.

Apa, A.O., D.W. Uresk and R.L. Linder. 1990. Black-tailed prairie dog populations one year after treatment with rodenticides. Great Basin Naturalist 50(2):107-113

Burger, L. W., Jr., E. W. Kurzejeski, T. V. Dailey, and M. R. Ryan. 1990. Structural characteristics of vegetation in CRP fields in northern Missouri and their suitability as bobwhite habitat. Transactions of the North American Wildlife Conference 55:75-8

Franzreb, K.E. 1990. An analysis of options for reintroducing a migratory, native passerine, the endangered Least Bell's Vireo in the Central Valley, California. Biological Conservation 53(2):105-124.

Hussell, D. J. T. 1990. Implications of age-dependent bill length variation in EMPIDONAX for identification of immature alder and willow flycatchers. Journal of Field Ornithology 61:54-63.

Nesbitt, S. A., and K. S. Williams. 1990. Home range and habitat use of Florida sandhill cranes. Journal of Wildlife Management 54:92-96.

Safina, C. 1990a. Foraging habitat partitioning in roseate and common terns. Auk 107:351-358.

Tyus, H. M., and C. A. Karp. 1990. Spawning and movements of razorback sucker, Xyrauchen texanus, in the Green River basin of Colorado and Utah. Southwestern Naturalist 35:427-433.

Peterson, R. T. 1990b. A field guide to western birds. Third edition. Houghton Mifflin Co., Boston. 432 pp.

Johnsgard, P. A. 1990. Hawks, eagles, and falcons of North America. Smithsonian Inst. Press, Washington, D.C. xvi + 403 pp.

DeBruin, E. 1990. Field survey to the Organ Mts, Soledad and Beasley Canyons, May 7, 1990.

Muldavin, Esteban. 1990. Community field surveys to the Gray Ranch.

DeGeus, D. W. 1990. Productivity and habitat preferences of loggerhead shrikes inhabiting roadsides in a midwestern agroenvironment. Iowa State University, Ames, Iowa. MS thesis.

Choquenot, D., B. Kay, and B. Lukins. 1990. An evaluation of warfarin for the control of feral pigs. J. Wildl. Manage. 54:353-359.

Dunmire, W. W. 1990. An investigation of biological resources focusing on plant and animal communities with recommendations for future management actions, Biological Inventory, Dark Canyon ACEC, Carlsbad Resource Area. Prepared for BLM by TNC Field Office

Hays, R.L., and A.H. Farmer. 1990. Effects of the CRP on wildlife habitat: emergency haying in the Midwest and pine plantings in the Southeast. Transactions of the North American Wildlife and Natural Resources Conference 55:30-39.

Pagels, J. F. 1990. Water shrew study progress report. Report submitted to Virginia Deptartment of Game and Inland Fisheries, Richmond, Virginia. Unpublished.

Knight, R. L., and D. P. Anderson. 1990. Effects of supplemental feeding on an avian scavenging guild. Wildl. Soc. Bull. 18:388-394.

Nichols, J. D., J. A. Spendelow, and J. E. Hines. 1990. Capture-recapture estimation of prebreeding survival rate for birds exhibiting delayed maturation. J. Field Ornithology 61:347-354.

Mehlhop, P. 1990. Field survey to Gray Ranch - high talus north of Brushy Peak, west facing of August 20, 1990.

Smith, H. M., C. E. Bock, and J. H. Bock. 1990. Notes on reproduction and coloration in the bunchgrass lizard, Sceloporus scalaris, in southeastern Arizona. Bull. Maryland Herp. Soc. 26(2):64-67.

Wakeley, J. S., T. H. Roberts, and C. O. Martin. 1990. Auditory survey methods. Section 6.3.5, U.S. Army Corps of Engineers Wildlife Resources Management Manual. Tech. Rep. EL-90-7. Waterways Expt. Station, Vicksburg, Mississippi. 34 pp.

Daly, L. Parker, M. (1990) 1990 Mexican Spotted Owl Inventory Form. Sandia Ranger District, Cibola National Forest, USFS. 24 p.

Meyer, K. D., and M. W. Collopy. 1990. Status, distribution, and habitat requirements of the American swallow-tailed kite (Elanoides forficatus) in Florida. Draft report No. NG86-025 submitted 29 July 1990. Florida Game and Fresh Water Fish Commission.

Ballen, M. 1990. 1990 Mexican Spotted Owl Inventory Form

Orr, Mary V. 1990. Threatened, endangered and sensitive plants observation record for Lilium philadelphicum. US Forest Service

Wyoming Natural Diversity Database. No date. Unpublished data on file. Wyoming Natural Diversity Database, Laramie, WY.

Meany, C. A., S. A. Bissell, and M. B. Dillon. 1990. Colorado mammal distribution latilong study. Colorado Division of Wildlife, Denver, Colorado.

Dixon, K. L. 1990. Constancy of margins of the hybrid zone in titmice of the PARUS BICOLOR complex in coastal Texas. Auk 107:184-188.