TY  - BOOK
AU  - Gregersen,Erik
TI  - Unmanned space missions
T2  - An explorer's guide to the universe
SN  - 9781615300181 
U1  - 629.435 22
PY  - 2010///
CY  - New York
PB  - Britannica Educational Pub. in association with Rosen Education Services
KW  - Space probes
KW  - Popular works
KW  - Space flights
N1  - Includes index
UR  - http://books.google.co.in/books?id=gDqfU6gcuXQC&lpg=PA1&dq=Unmanned%20space%20missions&pg=PA1#v=onepage&q&f=false
ER  -