A couple of highly rated books mentioned in the article:

Code Girls: https://www.amazon.com/Code-Girls-Untold-American-Breakers/d...

The Woman Who Smashed Codes: https://www.amazon.com/Woman-Who-Smashed-Codes-Outwitted/dp/...

also, a book just came out about Elizebeth Friedman and how a lot of her contributions to cryptology and the birth of sigint in general have been erased from histroy: https://www.amazon.com/Woman-Who-Smashed-Codes-Outwitted-ebo...

it's supposed to be very good, but I just started it last night so don't have much of an opinion yet.