The Grand Canyon management plan collection (1967-1974) contains memoranda and correspondence concerning meeting reviews, new regulations, research requirements, and safety procedures in Grand Canyon National Park. These memorandua and letters were written by the government offices of the National Park Service, Department of the Interior, and Grand Canyon National Park and sent to river running companies or vice versa.
The Antoine de Seynes papers (1938) contain materials documenting a French expedition kayak trip down the Colorado River. Included are correspondence, journals, articles, and a poem. Most of the materials are in French.