TY  - BOOK
AU  - Heyer, Paul
TI  - Communications and history
SN  - 313261571
CY  - New York
KW  - Civilization, Modern - history
KW  - Communication - history - 18th century
KW  - Communication - history - 19th century
KW  - Communication - history - 20th century
KW  - Communication media
KW  - Social evolution
KW  - Social theory
ER  -