TY  - BOOK
AU  - W.R. Williams
TI  - Principles of agriculture
U1  - 630 
PY  - 1949///
CY  - London
PB  - Hutchinson Scientific & Technical Publications
N1  - W.R. Williams: Principles of agriculture.  London.  Hutchinson Scientific & Technical Publications, 1949.--(630WIL)
ER  -