Whitehead, C.D. Some aspects of the influence of organic matter on soil fertility / C.D. Whitehead. - Ashford, Kent : Wye College, 1963. - 217-223 p. : ill. ; 25 cm. - Reprint ; no. 237 . Reprinted from Soils and Fertilizers, vol. XXVI, 1963 no. 4 Includes bibliographical references : p. 222-223. Subjects--Topical Terms: Humus.--------Soil fertility.--------