TY  - GEN
AU  - Ponnamperuma, Cyril
AU  - Cameron, A. G. W.
AU  - 
TI  - Interstellar communication: scientific perspectives
U1  - 521.582 
PY  - 1974///
CY  - Boston
PB  - Houghton Mifflin Company
KW  - Communication
ER  -