Bergtold, 1917
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Bergtold, William Harry. A Study of the Incubation Periods of Birds; What Determines Their Lengths,. Denver, Col.: Kendrick-Bellamy, 1917.Bergtold, William Harry. A Study of the Incubation Periods of Birds; What Determines Their Lengths,. Denver, Col.: Kendrick-Bellamy, 1917.
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2024-08-14
