Oh! I forgot, Vaughn's carbon printing manual!!! smiley face here.
When Paul Strand was dying he mumbled "all my books", then he was history. For silver printing the book to keep is the little Zone IV manual by Fred Picker. It's an excellent book that cuts though the technical information that the excellent Ansel Adams book series have. I have the early edition of AA and the last edition of the series too for an intense complete read.
For picture books, portfolios, the Brett Weston series is totally outstanding, to view them completely you need to have a magnifying glass, the printing is that good. Those who have them know what I mean.