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"Dr. Raymond Dowidat and his wife, Esther, arrived in 1937 for his first practice after internship, and the impulse for the film seems to have arisen from their desire to document Cologne before they moved on to his next position in Minneapolis." filmpreservation.org
Further information on Raymond Dowidat, his wife Esther and, Cologne: From the Diary of Ray and Esther can be found at the National Film Preservation Foundation