Buy the Book: Worlds of Their Own

Worlds of Their Own by Robert J. Schadewald is available from many different sources.



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ISBN13 (Paperback): 978-1-4363-0434-4
ISBN13 (Hardback): 978-1-4363-0435-1 and it's contents are copyright 2009 Lois Schadewald.
Background and planet images courtesy of NASA.