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What percentage of "good" books include an index?

For non-fiction, I think I have always unconsciously followed the GP rule, because I don't remember any book, good or bad, that lacked one.

Fiction, of course, rarely gets one.

I can't think of any fiction that has an index. Do you have examples?

Answering my own question: the American Society for Indexers has a list. https://www.asindexing.org/about-indexing/indexes-and-indexe...

Life is too short to read 99% books.