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

List of works by Richard Hertwig

Abstammungslehre, Systematik, Paläontologie, Biogeographie; ⬇️

Leipzig [etc.]B. G. Teubner, 1914.

General principles of zoology ⬇️

New York: H. Holt and Company, 1896.

General principles of zoology; ⬇️

New York, Holt, 1897.

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