This is a digital image from the Library of
Congress' online Prints and Photographs Collection.
Lower left-hand margin: U.S.
Geological Survey, J.W. Powell, Director. Model of Crater
Lake, Oregon. Vertical & horizontal scale 3 inch to 1 mile.
Model by Victor Mindelc?f under the direction of J.S.
Diller. Topography by Mark B. Kerr. 1892.