Aerial photo-interpretation of landforms and rural cultural features in glaciated and coastal regions : [by] William E. Powers and Clyde F. Kohn - Powers, William Edwards, 1902-; Kohn, Clyde Frederick, 1911- (Evanston, Ill. : Dept. of Geography, Northwestern University, 1959)
At head of title: The William and Marion Haas Research Fund
Mode of access: Internet.
Keywords: Aerial photography