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The plaque would probably be mentioned in many books. For example, it is featured in a Reader's Digest book called The Space Race.
It is also featured in a book I have called In quest of the UNIVERSE by Karl F.Kuhn and Theo Koupelis. A quick google tells me it is now up to its 5th edition. It is a comprehensive introduction to astronomy, diving into more of the physics and mathematics behind things.
Regards, Rob.
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