Mammoth plate photographs are photographic prints made through contact printing a photographic print from a large glass plate negative, usually 18 by 21 inches, but may vary in size from 15 by 18 inches to 22 by 25 inches. These large negatives allowed photographers to produce outsized photographic prints before the development of photographic enlargers. The collection consists of 57 black and white photographic prints roughly 21 x 17 inches Cite as: Mammoth Plate Photographs of the North American West. Yale Collection of Western Americana, Beinecke Rare Book and Manuscript Library. Call Number: WA Photos Folio 1