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Monographie
Diagnoses of some New-Genera of Boids
Ridgway Robert | Smithsoman Institution | 1920
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United States geological exploration of the fortieth parallel Clarence King, geologist-in-charge: Vol. IV
Meek F. B, Hall James, Whitfield Robert, Ridgway | [s. n.] | 1877
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U. S. geological exploration of the 40th parallel: Part III: Ornithology: Illustrated by 24 plates...
Ridgway Robert | Government printing office | 1877