El Salvador, a Case Study Upton Hatch, L. Harlan Davis. increased from 17.6 thousand quintals ( cwt . ) in 1968 to ... manzana ( one manzana equals 1.73 acres ) , cɔra yields increased from 16.4 in 1962-63 to 27.3 in 1971-72 , and sorghum ...
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