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6
Yearbook of Agriculture, 1943-1947. Science in farming
United States congressional serial set ; serial set no. 11077;House document / 79th Congress, 2nd session. House ; no. 708
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7
Yearbook of Agriculture, 1938
United States congressional serial set ; serial set no. 10192;House document / 75th Congress, 2nd session. House ; no. 398
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9
Valuing a Homeland Security Policy: Countermeasures for the..
NBER working paper series, no. w14325