This collection comprises Luna Bergere Leopold's extensive incoming correspondence and other papers mostly during his active retirement years (1986-2006), with some earlier papers. The collection also contains his profusely illustrated personal journal in 12 volumes (1931-2003) that include world travels; some 70 field notebooks (1937-2006) embracing localities in the Western and Northeastern United States, in Hawaii, and some foreign locations (chiefly in India and Israel); more than a hundred original plane table maps from locales in the United States; a significant set of correspondence and papers (1956-1986) from hydrologist and sedimentologist Ralph Alger Bagnold (1896-1990), who in his own right was a pioneer in modern sedimentology and hydrology; and publications and manuscripts over the course of Leopold's multidisciplined career.