Sort of an adult rather than children's book today but it is a great anthology of early space articles and experts.
Logan, Jeffrey. The Complete Book of Outer Space. New York: Gnome Press. (144 p.) 25 cm.
Reprinted as a 1953 softcover magazine by Maco Magazine as: The Complete Book of Outer Space. New York : Maco Magazine Corp. (144 p.) 24 cm.
And in the UK as: