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r burnell held
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Soil conservation in perspective
R. Burnell Held · Earthscan LLC
344 sayfa · 1965
Soil conservation / TECHNOLOGY & ENGINEERING / Agriculture / General
Clawson, Held, Stoddard LAND FOR THE FUTURE 1st HC DJ
Marion Clawson, R. Burnell Held, Charles H. Stoddard · The Johns Hopkins Press
598 sayfa · 1968
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