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The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Print Collection, The New York Public Library. "Charles A. Young, Professor of Astronomy in Princeton College" The New York Public Library Digital Collections. 1877 - 1899. https://digitalcollections.nypl.org/items/3ab9d6d0-49d9-0133-6ef5-00505686a51c
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Print Collection, The New York Public Library. "Charles A. Young, Professor of Astronomy in Princeton College" New York Public Library Digital Collections. Accessed May 11, 2024. https://digitalcollections.nypl.org/items/3ab9d6d0-49d9-0133-6ef5-00505686a51c
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Print Collection, The New York Public Library. (1877 - 1899). Charles A. Young, Professor of Astronomy in Princeton College Retrieved from https://digitalcollections.nypl.org/items/3ab9d6d0-49d9-0133-6ef5-00505686a51c
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(still image)
Charles A. Young, Professor of Astronomy in Princeton College, (1877 - 1899)
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