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Aerial view of the ruins of Square Tower Ruin, one of the moderate-sized cliff dwellings of Mesa Verde, nestled in Navajo Canyon. Printed text at the top: 'Square Tower Ruin is one of Mesa Verde's moderate-sized cliff dwellings. Here it is seen from a viewpoint on the east rim of Navajo Canyon. Color note: For best autumn colors, visit Mesa Verde between September 10 and October 15. Color photo by Ansel F. Hall'. Reverse: handwritten letter to Sally and Billy, dated August 28, 1979, sent from Wind River, WY, to Santa Fe, N.M., with a 'PEOPLE'S RIGHT TO KNOW' 10¢ stamp and cancellation 'WYFF' AM 1979.