Ottawa, Canada. Copyright 1971 Shaw Photogrammetric Services Ltd. Drawn by J. Mietztzer. [Cover title:] 12th International Congress of Photogrammetry July 23 to August 4.../12 ieme Congrès International de la Photogrammétrie, 23 juillet au 4 aout. Parc Landsdowne, Ottawa, Canada 1972. [cartographic material]

Date modified: