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1Βιβλίοανά Harman, Jay R.“…Association of American Geographers. Commission on College Geography…”
Έκδοση 1971
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2Βιβλίοανά Rayner, John N.“…Association of American Geographers. Commission on College Geography…”
Έκδοση 1972
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3Βιβλίοανά Harvey, David, 1935-“…Association of American Geographers. Commission on College Geography…”
Έκδοση 1972
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4Βιβλίοανά Muehrcke, Phillip“…Association of American Geographers. Commission on College Geography…”
Έκδοση 1972