Ammodramus savannarum ammolegus
Black, C. and J. Black. 1991. Gray Ranch breeding bird surveys June, August, November 1991. Unpubl. field notes for survey done for NMNHP.
West, S. 1990. Fall 1990 report on birds of Gray Ranch. Unpubl. report for the Nature Conservancy (New Mexico Natural Heritage Program) dated 1 Aug. - 30 Nov 1990. 12 p.
Williams, S.O. 1987. Grasshopper sparrow. New Mexico Ornithological Society field notes, Goodman, R.A. (ed.) Vol. 26, no. 3, June 1 - July 31, 1987. P.39.
Williams, S.O. III. 1991. Gray Ranch and Hidalgo Co bird notes from 6-9 Aug 1990. Survey Unpubl. notes dated 9 March 1991. 14 pp.
Jenness, R. 1988. Unpublished letter or unusual bird forms to New Mexico Ornithological Society.
Castetter, R. 1990. Bird survey of Gray Ranch and Organ mountains. Unpubl. report for New Mexico Natural Heritage Program. 25 p.
Meents, J.K. 1979. Avian community structure in Chihuahuan desert grasslands. Unpubl. dissertation New Mexico State University. 69pp.
Williams, S.O. 1990. Cloverdale breeding bird survey. Conducted 87-06-10, 88-06-02, 89-06-18, 90-06-04. 5 pp.
Hubbard, J.P. 1987. The vegetative communities and vertebrate fauna of the Gray Ranch Hidalgo County, New Mexico. Unpubl. manuscript for Endangered Species Program of New Mexico Dept. of Game and Fish, Santa Fe, NM. 82 pp.
Black, C. and J. Black. 1991. Field survey to Gray Ranch - Fitzpatricks - site #1 on 20-21 June 1991.