United States. Study Commission on the Savannah, Altamaha, Saint Marys, Apalachicola-Chattahoochee, and Perdido-Escambia River Basins and Intervening Areas
Agricultural Research Service, Cooperative State Research Service, U.S. Department of Agriculture ; in cooperation with state agricultural experiment stations and other collaborators
Agricultural Research Service, Cooperative State Research Service, U.S. Department of Agriculture ; in cooperation with state agricultural experiment stations and other collaborators