TY  - BOOK
AU  - Tan, Kim H.
TI  - Humic matter in soil and the environment: principles and controversies
SN  - 9781482234459
U1  - 631.417 
PY  - 2014///
CY  - Boca Raton
PB  - Crc Press
KW  - Soils -- Humic acid content
KW  - Humus -- Environmental aspects
ER  -