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BAILEY, V. 1926. A biological survey of North Dakota. North Am. Fauna 49:55-58.

BRADLEY, W. G. 1967. Home range, activity patterns, and ecology of the antelope
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DRABEK, C. M. 1973. Home range and daily activity of the round-tailed ground 
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HAGGERTY, S. M. 1968. The ecology of the Franklin's ground squirrel at Itasca 
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