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Since I started looking for books to learn physics I've had a problem understanding what exactly is meant by "graduate level" and "undergraduate level" textbooks, given how two books in each category can seem to cover the same topics. A good example of this is Weinberg's "Lectures on Quantum Mechanics" and Rae's "Quantum Mechanics". The contents look very similar with a few exceptions.

So what is it that puts a book on quantum mechanics in either level? And how can I distinguish that when the subjects covered look similar?