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

List of works by Edward L. Youmans

Asa Gray correspondence. Senders Y-Z ⬇️

Harvard University Botany Libraries

The Spots on the Sun ⬇️

1872 article

The correlation and conservation of forces: a series of expositions ⬇️

New York, D. Appleton, 1865.

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