Soil conservation in perspective
631.45
H474S Held, R. Burnell and Clawson, Marion
Soil conservation in perspective
-- Blatimore : Johns Hopkins , 1965
162647 xiii, 344p.:ill.,tab.
Soil conservation-U.S.
H474S Held, R. Burnell and Clawson, Marion
Soil conservation in perspective
-- Blatimore : Johns Hopkins , 1965
162647 xiii, 344p.:ill.,tab.
Soil conservation-U.S.