Held, R. Burnell
Soil conservation in perspective / R. Burnell Held ; Marion Clawson - Baltimore : Jones Hopkins Press, 1965
Includes bibliographical references and index.
Soil erosion--Soil conservation
Agricultural land conservation--Techniques, equipment, materials
631.45 / HEL
Soil conservation in perspective / R. Burnell Held ; Marion Clawson - Baltimore : Jones Hopkins Press, 1965
Includes bibliographical references and index.
Soil erosion--Soil conservation
Agricultural land conservation--Techniques, equipment, materials
631.45 / HEL