The Look and Learn Book of Galactic Civilisations: AD 3000-5000

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Prior to arriving at Io, the Seventh Doctor gave Melanie Bush a copy of The Look and Learn Book of Galactic Civilisations: AD 3000-5000 to read. It had a "simplistic prose style but very nice illustrations".

Mel used the book to learn about the Hub. (PROSE: Uranus)