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The Feynman Lectures on Physics
(www.feynmanlectures.caltech.edu)
(Without being an expert in physics) I think these still mostly stand up, despite being from 1963; the major exceptions being a lot of particle physics from the 1970s-80s and some other things from that decade which I forget
True! Sometimes I lament that in fluid mechanics, very few theoretical advancements were made from the 1980s and forward. Possibly a side effect of research moving towards a more computational and applied direction. New discoveries were made, but the are all eclipsed by the discoveries in 19th and early 20th centuries.
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