What are some lesser-known Rust books worth reading?

So, not things like the Rust Book and Rust for Rustaceans that are recommended here frequently. They're great, but I'm also looking for less widely-known books, like The Secrets of Rust Tools, Effective Rust, and Idiomatic Rust, for example.

What are your favorite hidden gems? Bonus points for saying why you think they're worth reading in addition to the standard works.