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Mehlhop, P. 1990. Field survey to Gray Ranch - S. Animas Valley and Playas Valley, McKinney flats. 2100-0200 hrs, 18 Sept. 1990.

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James, P.C., G.A. Fox, and T.J. Ethier. 1990. Is the operational use of strychnine to control ground squirrels detrimental to burrowing owls? Journal of Raptor Research 24:120-123.

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