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Commercial Fertilizers and Poisonous Insecticides in 1906-7.
(Texas Agricultural Experiment Station, 1907)
Commercial Fertilizers and Poisonous Insecticides in 1907-8.
(Texas Agricultural Experiment Station, 1908)
Commercial Fertilizers and Poisonous Insecticides in 1908-9.
(Texas Agricultural Experiment Station, 1909)