Popenoe, H. (1976). Soil conservation in Central America and Panama: Current problems.
शिकागो स्टाइल उद्धरणPopenoe, Hugh. Soil Conservation in Central America and Panama: Current Problems. 1976.
एमएलए उद्धरणPopenoe, Hugh. Soil Conservation in Central America and Panama: Current Problems. 1976.
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