A First Course in General Relativity by Bernard Schutz, 2ND INTERNATIONAL ED.

Spacetime and Geometry: An Introduction to General Relativity - VERY GOOD

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Electronics : A Complete Course by Nigel P. Cook (2003, Hardcover)

Engineering Electronics by Ryder, 2nd Edition – International Student Edition

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Electronics: A Complete Course (2nd Edition) by Cook, Nigel P.