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Credit
Anleitung zum Studium der Dioptrik des menschlichen Auges : ein Beitrag zur Physiologie und Pathologie des Gesichtssinnes / von Wilhelm Zehender. Public Domain Mark. Source: Wellcome Collection.
Provider
This material has been provided by the Francis A. Countway Library of Medicine, through the Medical Heritage Library. The original may be consulted at the Francis A. Countway Library of Medicine, Harvard Medical School.