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De Ong, Elmer Ralph, 1882
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Chemistry and uses of insecticides
.
by
De Ong, Elmer Ralph, 1882
; New York: Reinhold Pub. Corp, 1948.
Subject:
Insecticides
.
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Relevance: 30.72%
Chemistry and uses of pesticides
.
by
De Ong, Elmer Ralph, 1882
; New York: Reinhold Pub. Corp, 1956.
Subject:
Insecticides
.
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Relevance: 30.72%
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