A really good refresher on college physics,
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This review is from: The Theoretical Minimum: What You Need to Know to Start Doing Physics (Hardcover)
This book is unique in my experience. It is not a college textbook yet it covers most of the key topics in mathematical physics at undergraduate level. I did a Physics degree 40 years and I have not revisited this are of my knowledge since. This is for me a wonderful rediscovery of my undergraduate passions.