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

List of works by Heinrich Friese

Apidae I. Megachilinae ⬇️

book (1911) by Heinrich Friese, vol. 28 of the series "Das Tierreich"

Die Bienen Afrikas nach dem Stande unserer heutigen Kenntnisse ⬇️

Die Insekten Mitteleuropas insbesondere Deutschlands ⬇️

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