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Overhead Projector, 3M Institute, Edward McMahon, Mankato State College, 1965-07-08.
Mankato State College
Lectures and lecturing
University Archives and Southern Minnesota Historical Center, Memorial Library, Minnesota State University, Mankato (contributing organization)
Edward McMahon, the Chairman of the Audio-Visual Department at Mankato State College, giving a talk at the Minnesota Mining and Manufacturing Company (3M) Institute about an overhead projector.
10 x 12
University Photograph Collection, 1868-ongoing. MSU Archives 309.