The keyword-search method works for finding terms, but it's not as helpful when the index refers to more abstract matter. I recently had to help a small publishing house update a book for a new edition, and we found this to be a problem. Sections about 'communism', for example, didn't always include the word 'communism' or any synonym thereof. It'd be nice if the publishers always took the time to make e-versions correspond to print. It IS the future.
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