00817cam a22002651 4500 agr48000213 DLC 20260227111008.0 740313s1948 xx 000 0 eng agr48000213 (OCoLC)829587 DLC OKentU OCoLC DLC premarc S633 .H76 1948 Hopkins, Donald Percy, 1909- Chemicals, humus, and the soil; a simple presentation of contemporary knowledge and opinions about fertilizers, manures, and soil fertility. [American ed.] Brooklyn, Chemical Pub. Co., 1948. viii, 358 p. illus. 21 cm. Bibliography: p. 347-349. Fertilizers. Manures. Humus. Soil fertility. 10808 10808