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Experiments with cotton

Duggar, J. F. (John Frederick), 1868- (2011-07-19)

Co-operative fertilizer experiments with cotton in 1896

Duggar, J. F. (John Frederick), 1868- (2011-07-19)

Experiments with corn

Duggar, J. F. (John Frederick), 1868- (2011-07-19)

Experiments with corn

Duggar, J. F. (John Frederick), 1868- (2011-07-19)

Experiments with cotton

Duggar, J. F. (John Frederick), 1868- (2011-07-19)

Co-operative fertilizer experiments with cotton, 1898

Duggar, J. F. (John Frederick), 1868- (2011-07-19)

Experiments with cotton, 1898

Duggar, J. F. (John Frederick), 1868- (2011-07-19)

Experiments with crimson clover and hairy vetch

Duggar, J. F. (John Frederick), 1868- (2011-07-19)

Velvet beans

Duggar, J. F. (John Frederick), 1868- (2011-07-19)

Peanuts, cowpeas and sweet potatoes as food for pigs

Duggar, J. F. (John Frederick), 1868- (2011-07-19)