TY  - BOOK
AU  - Webb, John W
AU  - Reis, Ronald A.
TI  - Programmable logic controllers : principles and applications 
SN  - 8120323084 
U1  - 621.3951 
PY  - 1994///
CY  - Usa
PB  - Prentice Hall Of International
KW  - Applied physics
ER  -