TY  - BOOK
ED  - Indian Standards Institution                                                                                                                                                                                                                                   . 
TI  - Specification for tractor-mounted spring-loaded cultivators, IS6638-1972 / 
U1  - 631.316 
PY  - 1972///
CY  - New Delhi : 
PB  - Indian Standards Institution , 
ER  -