Bibliography and Links
Basic books for beginners:
|  | John P. Schaefer, The Ansel Adams Guide: Book 1: Basic Techniques of Photography | 
|  | John P. Schaefer, The Ansel Adams Guide: Basic Techniques of Photography: Book 2 | 
The next stage:
More advanced topics:
|  | Phil Davis, Beyond the Zone System | 
|  | Ctein, Post Exposure: Advanced Techniques for the Photographic Printer | 
Other topics:
|  | Stephen G. Anchell, The Darkroom Cookbook | 
|  | Gordon Hutchings, The Book of Pyro; Bitter Dog Press, P.O. Box 2324, Granite Bay, CA 95746 | 
|  | Tim Rudman, The Photographer's Toning Book: The Definitive Guide | 
|  | Ansel Adams, Polaroid Land Photography | 
Links:
Tri-Ess Sciences Inc. (website is evidently down; write or call: Tri-Ess Sciences, 1020 Chestnut St, Burbank, CA 91506; (818) 848-7838)
Reilly et al., Stability of Black-and-White Photographic Images, with Special Reference to Microfilm