TUCSON BOYS' CHOIR, Saguaro National Monument. In the midst of vegetation typical of Old Mexico, the internationally famous Tucson Boys' Choir sings around a campfire. The giant saguaro cactus has its real home in northwestern Mexico, where it has adapted itself to meet the requirements of a patching atmosphere and month after month of rainless heat. In the United States it grows only in southern Arizona and one or two isolated places in California. The giant saguaro reaches its maximum size and densest stand at the foot of the Tanque Verde Mountains in the western portion of Saguaro National Monument. (Photograph by Manley.)

CAMPERS AT GRINNELL LAKE; GRINNELL GLACIER IN BACKGROUND, Glacier National Park. With over 1,000 miles of wilderness trails, Glacier is an ideal camping area. This party is traveling with its own guide. Others prefer to join one of the scheduled saddle-horse trips. Several trails lead across the international boundary into Canada's Waterton Lakes National Park. Courtesy, Great Northern Railway.)