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Ruth Spiro and Irene Chan


Loop Quantum Gravity for Everyone

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The Ascent of Gravity

Marcus Chown


Beyond Einstein's Unified Field: Gravity & Electro-Magnetism...

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Kip S. Thorne, Charles W. Misner, et al.


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Cosmology for the Curious

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Jump: some kind of future

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Gravity: A Very Short Introduction

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UFOs and Anti-Gravity

Leonard G. Cramp