TY  - GEN
AU  - Orlov, D S
TI  - Humic substance of soils and general theory of humification
SN  - 8120409183
U1  - 631.417 ORL 
CY  - Newdelhi, Oxford & IBH publishing co. pvt. ltd
KW  - Soil-humification/soil-general theory of humification
ER  -