Hopkins, Donald P.
Chemicals, humus and the soil : a simple presentation of contemporary knowledge and opinions about fertilizers, manures and soil fertility / Donald P. Hopkins. - London : Faber and Faber, 1945. - 278 p. : ill. ; 22 cm.
Includes bibliographical references and index.
Soil science.
Humus.
631.41 / HOC
Chemicals, humus and the soil : a simple presentation of contemporary knowledge and opinions about fertilizers, manures and soil fertility / Donald P. Hopkins. - London : Faber and Faber, 1945. - 278 p. : ill. ; 22 cm.
Includes bibliographical references and index.
Soil science.
Humus.
631.41 / HOC