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Local fertilizer experiments with cotton in north Alabama in 1912

Duggar, J. F. (John Frederick), 1868-; Williamson, J. T. (John T.); Hawley, L. J. (2010-11-15)

Local fertilizer experiments with cotton in south Alabama in 1913

Duggar, J. F. (John Frederick), 1868-; Williamson, J. T. (John T.); Hawley, L. J. (2010-11-15)

Local fertilizer experiments with cotton in north Alabama in 1913

Duggar, J. F. (John Frederick), 1868-; Williamson, J. T. (John T.); Hawley, L. J. (2010-11-15)

Local fertilizer experiments with cotton in south Alabama in 1912

Duggar, J. F. (John Frederick), 1868-; Williamson, J. T. (John T.); Hawley, L. J. (2010-11-10)