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1221
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1222
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1223
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1224
Choice of technique by lexicographic state first for peasant agriculture and reswitching of risky techniques [microform]
Published 1976Visual Material -
1225
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1226
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1227
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1228
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1229
The probable impact of the seed-fertilizer revolution on grain production and on farm labor requirements [microform]
Published 1976Visual Material -
1230


