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Authors
Author
J. N. Harper
Books
Analyses of Commercial Fertilizers
Curtis Criss McDonnell, Clifford Lewis Newman, Albert Frederick Conradi, Charles Carter Newman, J. N. Harper, E. Barnett, Henry Walter Barre, M. Ray Powers, Thomas Ellison Keitt, William Andrew Thomas
Commercial Fertilizers
Robert Graham, Arthur Louis Brueckner, Harrison Garman, Melville Amasa Scovell, David William May, J. N. Harper, R. L. Pontius
