Dictionary of agricultural and environmental science / Frederick R. Troeh and Roy L. DonahueFrederick R. Troeh, Roy Luther Donahue · First published 2003Open the Tome
Soil and water conservationFrederick R. Troeh, J. Arthur Hobbs, Roy L. Donahue · First published 1991Open the Tome
Soil and water conservation for productivity and environmental protectionFrederick R. Troeh · First published 1980Open the Tome
