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Posted January 30, 2014
Having read the 3rd edition published 1910 (also free from Barnes & Noble), I scimmed this 4th edition published 1917. Whatever changes author Mitton made must be minor &/or subtle. Based on the 3rd edition, this ebook is probably a good snapshot of some space science and children's education in 1917.
This 4th edition ebook also uncludes illustrations, which are also too small to easily read their labels.
This ebook has scanning errors, but the errors do not interfere with understanding the text.