Hopkins, Donald Percy 1909-
Chemicals, humus, and the soil; a simple presentation of contemporary knowledge and opinions about fertilizers, manures, and soil fertility / Donald Percy Hopkins. - [American ed.] - London : Faber and Faber Limited, 1948. - 287 p. : ill. ; 21 cm.
Includes Bibliographical references and index.
agr48000213
Fertilizers.
Manures.
Humus.
Soil fertility.
S633 / .H76 1948
631.8 / HOC
Chemicals, humus, and the soil; a simple presentation of contemporary knowledge and opinions about fertilizers, manures, and soil fertility / Donald Percy Hopkins. - [American ed.] - London : Faber and Faber Limited, 1948. - 287 p. : ill. ; 21 cm.
Includes Bibliographical references and index.
agr48000213
Fertilizers.
Manures.
Humus.
Soil fertility.
S633 / .H76 1948
631.8 / HOC