Abstract The Mary Armstrong Milligan photograph collection consists of slides and photographs of river trips in Glen Canyon during the 1950s and 1960s. Mary A. Milligan was part of the crew on several SOCOTWA river trips in the late 1950s and early 1960s. SOCOTWA was an organization founded in the South Cottonwood Ward, Salt Lake County, that organized recreational and educational field trips for LDS groups, Boy Scouts, etc.,...