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Dupont annual report
(1979)
Size, structure and the changing face of American agriculture
Hallam, Arne, (1993)
Agricultural economics and agribusiness
Cramer, Gail L., (1982)
Efficiency of credit flows into agriculture
Luttrell, Clifton B., (1968)
Food and agriculture in 1973
Luttrell, Clifton B., (1973)
Food and population : a long view
Luttrell, Clifton B., (1976)