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Authors whose works are in public domain in at least one jurisdiction

List of works by Peter Walter Claassen

A monograph of the Plecoptera or stoneflies of America north of Mexico ⬇️

LaFayette, Ind., 1925.

Laboratory directions in general biology prepared to accompany text book on General biology ⬇️

Ithaca, N.Y.,The Comstock publishing co.[c1922] | Library of Congress

The grasshoppers of Kansas ⬇️

Topeka: University of Kansas, 1917.

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