. . "Grand Canyon (Ariz.)" . . "Colorado River (Colo.-Mexico)" . . . . . "Running the Colorado River"@en . "Running the Colorado River" . . . "Interviews"@en . "Interviews" . . "Comments on the beginning of his interest in running rivers in 1942; difficulties in running the Colorado through the Grand Canyon; John W. Powell's trip and other early explorations of the Canyon. Biographical material and bibliography of Marston's writings included."@en . "Comments on the beginning of his interest in running rivers in 1942; difficulties in running the Colorado through the Grand Canyon; John W. Powell's trip and other early explorations of the Canyon. Biographical material and bibliography of Marston's writings included." . . . . . . . "Oral histories"@en . . "Oral histories" . .