Ellen, you can buy all of those books and you won't feel that you have repeated information. Sure the same processes are coverer in each of the books, but with a different style and approach. The Coming Into Focus is the most straight photography oriented book I've seen, nice for photographers. Others, like the Book of Alternative Photographic Processes is more oriented to photographic artists that use the camera to produce photographic art that does not look much like photographs. I own all of them and go back to the for the pure pleasure of reading.
Another book worth buying, although harder to find is The Keepers of light. This book is much more interested in the progression of the photographic processes. It is an awesome book, but wouldn't buy just for learning any of the processes. It is more for learning history than processes.
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