TY  - BOOK
ED  - Pontifical Academy of Sciences. Rome
TI  - Study week on organic matter and soil fertility
U1  - 631.43 
PY  - 1968///
CY  - Amsterdam
PB  - North Holland
KW  - Soil fertility
KW  - Soil physics
N1  - held April 22-27, 1968
ER  -