TY  - BOOK
AU  - John W. Webb, Ronald A. Reis.
TI  - Programmable logic controllers: principles and applications 
SN  - 136794084
U1  - 629.89   W365 
PY  - 1999///
CY  -  N.J
PB  - Prentice Hall
KW  - Programmable controllers
N1  - Includes bibliographical references (p. 435-437) and index
ER  -