TY  - BOOK
AU  - Seifert, A.
TI  - Investigation of three systems of hydraulic depth control when ploughing on changing soil types
U1  - 631.372 S27I 
PY  - 1965///
CY  - Bedford, U. K.
PB  - National Institute of Agricultural Engineering
KW  - PLOUGHING
KW  - TRACTORS -- HYDRAULIC EQUIPMENT
ER  -