TY  - BOOK
AU  - International Congress of Soil Science (1961: Madison)  
TI  - Transactions of the 7th international congress of soil science. Vol. 2: commissions II soil chemistry and III soil biology
PY  - 1961///
CY  - Gronigen
PB  - International Society of Soil Science
KW  - Soil science--Congresses
ER  -