Farm soils, their management and fertilization /
Worthen, Edmund.
Farm soils, their management and fertilization / Edmund Worthen. - 4th edition. - Wiley, 1948. - xiii, 510 pages : illustrations.
Farm soils, their management and fertilization / Edmund Worthen. - 4th edition. - Wiley, 1948. - xiii, 510 pages : illustrations.