TY  - BOOK
AU  - Waksman, Selman A.
TI  - Humus: origin, chemical composition and importance in nature
U1  - 631.417 21st ed.
PY  - 1936///
CY  - London
PB  - Bailliere Tindall and Cox
KW  - Chemical composition
KW  - Humus
KW  - Microbiology
KW  - Social chemistry
N1  - Bibliography: p. 413-94 includes index
ER  -