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TitleDateType
1 Call of the canyons--A vacationist's-eye view of Bryce, Zion and the Grand Canyon1947; 1948Image/MovingImage
2 Prevention pays off: on the trail of disaster1946; 1947; 1948; 1949; 1950; 1951; 1952; 1953; 1954; 1955Image/MovingImage
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