Great list! I wish there were a term like novella for non-fiction. Many of these, I suspect are not book length but more essay or novella length (< 30,000 word

Great list! I wish there were a term like novella for non-fiction. Many of these, I suspect are not book length but more essay or novella length (< 30,000 words ). That is fine, I don't need people to pad out a book, but I'd like to understand the length a bit before hand.