TY  - BOOK
AU  - Ryan,Peter
AU  - Pesek,Ludek
TI  - Journey to the Planets /: Explorer 1 
PY  - 1972///
CY  - Harmondsworth, Middlesex, England
PB  - A Puffin Original / Penguin Books
KW  - Աստղագիտություն
KW  - Planets
N1  - Index, p. 48
ER  -