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Oklahoma Agricultural Experiment Station, Bulletin no. 318, January 1948: Fertilizer recommendations for 1948 Oklahoma crops
(Oklahoma Agricultural Experiment Station, 1948-01)
Oklahoma Agricultural Experiment Station, Bulletin no. 305, February 1947: Fertilizer recommendations for Oklahoma crops
(Oklahoma Agricultural Experiment Station, 1947-02)
Oklahoma Agricultural Experiment Station, Bulletin no. 326, January 1949: Fertilizer recommendations for Oklahoma crops
(Oklahoma Agricultural Experiment Station, 1949-01)