TY  - BOOK
AU  - Markus, John
TI  - Communications circuits ready-reference
SN  - 0-07-040460-7
U1  - 621.3815 
PY  - 1980///
CY  - New York
PB  - McGraw-Hill
KW  - Electric circuits
KW  - Tele commnucation
KW  - Telephony circuits
N1  - Includes index
ER  -