In the nineteenth century the great expeditionary photographers William Henry Jackson, T. H. O'Sullivan, and William Bell first photographed American western landscapes for geological and geographical surveys. Mark Klett, chief photographer of the Rephotographic Survey Project, revisited and rephotographed these nineteenth-century sites during the late 1970s, presenting 120 pairs of photographs separated by a century of change. Two decades later, Klett organized a new survey team to rephotograph 110 sites. This book presents forty-three pairings from the third survey, documenting two periods of geologic and environmental changes while exploring changing human perceptions of landscape. Includes interactive DVD.