Eocene insects from the Rocky Mountains
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書誌事項
Eocene insects from the Rocky Mountains
（Proceedings of the United States National Museum, v. 57,
Government Printing Office, 1920
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注記
Includes bibliographical references
Eocene insects from the Rocky Mountains
（Proceedings of the United States National Museum, v. 57,
Government Printing Office, 1920
Includes bibliographical references