TY  - BOOK
AU  - Ledley,Robert   Steven, x
AU  - x
TI  - Digital  computer  and  control  engineering: x
SN  - x
U1  - 629.8/LED 
PY  - 1960///
CY  - N. Y.
PB  - McGraw-  Hill
KW  - Electrcity
KW  - Computers
ER  -