TY  - BOOK
AU  - Crispin 
TI  - Programmable logic controllers and their engineering applications 
SN  - 0077093178
U1  - 629.89 CRI 1997 
PY  - 1997///
CY  - London
PB  - McGraw Hill
KW  - Programmable controllers
N1  - Includes index
ER  -