This collection consists of thousands of photos dating from 1868 to the present with emphasis on geology, earthquake damage, and national parks and monuments. Pioneer photographers such as W.H. Jackson, J.K. Hillers, T.H. O'Sullivan, A.J. Russell and others are featured in one section. Other topics include the Mount St. Helens volcanic eruption of 1980, and mines, mills and quarries. The system allows searching from a list of subjects, as well as a free form search. All photos are available in 100, 700 and 1400 dots per inch resolution.