Bagnold, Ralph A. (Ralph Alger), 1896-

Ralph A. Bagnold is a British engineer, soldier, explorer and theoretical physicist who has published widely on sediment-transport physics.

Luna Bergere Leopold, former Chief Hydrologist of the U.S. Geographical Survey, is a professor of geology and geophysics at UC Berkeley. Chiefly interested in the hydrology of arid regions, rainfall characteristics and river morphology, erosion and sedimentation, Leopold is the author of numerous works in the field of hydrology.

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