Abstract The A. Oscar Olson photograph collection consists of digital scans of slides put together as a slide show by A. Oscar Olson. Most of them were taken during a Glen Canyon river trip with SOCOTWA Expeditions in May, 1962; while the rest were taken on later visits to Lake Powell in the 1960s through 1990s. He took the later photographs in order to show the changes in the original locations brought about by the filling of...