Biodiversity Heritage Library mailto:biodiversitylibrary@gmail.com William Brewster correspondence. Letters from Ralph Hoffmann Hoffmann, Ralph, 1870-1932 creator Brewster, William, 1851-1919 contributor text book Harvard University, Museum of Comparative Zoology, Ernst Mayr Library
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 ENG 1851-1919 Brewster, William, Correspondence Hoffmann, Ralph Ornithology Museum of Comparative Zoology--Biodiversity Heritage Library digitization project https://www.biodiversitylibrary.org/item/281959 1035352207 Harvard University, Museum of Comparative Zoology, Ernst Mayr Library https://www.biodiversitylibrary.org/item/281959 https://www.biodiversitylibrary.org/pagethumb/59967377 Public domain. The BHL considers that this work is no longer under copyright protection.