TY  - BOOK
AU  - Fang, Irving
TI  - A history of mass ommunication: six information revolutions 
SN  - 0240802543
U1  - FOR 302.209 F21h 1997 
PY  - 1997///
CY  - Boston : 
PB  - Focal Press, 
KW  - Communication
KW  - History
N1  - Includes index; Bibliography: pages 244-267
ER  -