I have discovered that Amazon has a large collection of new and used Kodak publications. Prices are quite reasonable for used copies. These books are usually soft cover ones on subjects ranging from simple HOW TO books to more technical ones. Subjects can vary from how to build a darkroom, filters and their use to infra-red photography and what many would like "Processing Chemicals and Formulas for Black and White Photography."
Go to Amazon and search for "Kodak publication" to bring up a list. Enjoy