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Some courses are online for free. For organic chemistry basicshttps://people.chem.ucsb.edu/neuman/robert/orgchembyneuman/BookContents.htmlthere are more.Equivalents of books exist on the Internet too. I know some for relativity, mechanical engineering, quantum mechanics, maths, power electronics.Generally speaking, these works were meant by the authors to be spread for free on the Web. If you consider finding expensive paper books for cheap or free on the Web, it would raise some questions about intellectual property.