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Unknown. 1964. Astragalus cobrensis general information. United States Forest Service (USFS) Regional Office, Albuquerque, NM. p.4.

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Anonymous. 1963. A monster named Gila. New Mexico Wildlife. 8(3):11.

Graber, R.R., and J.W. Graber. 1963. A comparative study of bird populations in Illinois, 1906-1909 and 1956-1958. Illinois Natural History Survey Bulletin 28:383-528.

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