TY  - BOOK
AU  - Parr, E. A.
TI  - Programmable controllers: an engineer's guide 
SN  - 0750604980
U1  - 629.895 PAR 
PY  - 1993///, repr. 1997
CY  - Oxford
PB  - Newnes
KW  - Programmable controllers
N1  - Includes bibliographical references and index
ER  -