TY  - BOOK
AU  - Skvirsky, David
TI  - ON THE TRACK OF DISCOVERY
U1  - 509 
PY  - 1967///
CY  - Moscow
PB  - Progress Publishers
KW  - Riddles
KW  - Outer Space
N1  - Contents. -- Riddles Of Outer Space. -- Scientists Unravel Mysteries. -- Blank Spots In Science. -- Secrets Of History
ER  -