Beinecke Rare Book and Manuscript Library > [No. 1194. View of sandstone rock formations identified as the Seal and Bear in the Garden of the Gods, Colorado Springs (El Paso County), Colorado. Shows a dirt road, Pikes Peak is in the distance]
A mammoth plate is a photographic negative plate size, usually 18 by 21 inches (53.5 x 45.7 cm.) with photographic prints made through contact printing.