TY  - BOOK
AU  - Thaer, R.
TI  - Experiments with ridgers of different pitch and side angles
U1  - 631.31 T30E 
PY  - 1962///
CY  - Bedford, U.K.
PB  - National Institute of Agricultural Engineering
KW  - AGRICULTURAL IMPLEMENTS
KW  - AGRICULTURAL ENGINEERING
ER  -