TY  - BOOK
AU  - Ratan lal
AU  - B.A. Stewart
TI  - Principles of Sustainable Soil Management in Agro ecosystems 
SN  - 978-1-138-62725-3
U1  - 631.4 LAL  
PB  - CRC Press 
KW  - Principles of Sustainable Soil Management in Agro ecosystems
ER  -