TY  - BOOK
TI  - On the track of discovery : Riddles of outer Space, Scientists Unravel Mysteries, Blank Spots in Science, Secrets of history, Series 3
T2  - Series 3
U1  - 910.9 O581 1967 
PY  - 1967///
CY  - Moscow
PB  - Progress Publishers
KW  - Curiosities and wonders
KW  - Exploration of outer space
ER  -