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De Ong, E. R. (Elmer Ralph), 1882-1966 (2)
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Insect, fungus and weed control / by E.R. de Ong.
De Ong, E. R. (Elmer Ralph), 1882-1966.
|
Date: 1953
Books
Chemistry and uses of pesticides / [Elmer Ralph De Ong].
De Ong, E. R. (Elmer Ralph), 1882-1966.
|
Date: [1956]
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