TY  - BOOK
AU  - STEVENSON, F. J.
TI  - Cycles of Soil. Carbo, Nitrogen, Phosphorus, sulfur, micronutrients 
SN  - 0-471-82218-3
PY  - 1986///
CY  - Canada 
PB  - John Wiley
KW  - QUIMICA DEL SUELO
ER  -