St Ansel's books, perhaps especially The Negative aren't the best starting point, but they do have a lot of information. Like others have said, I tried to read it long ago, got completely lost and put it down for twenty or so years before looking at it again. In that time I had learned enough from other sources that it began to make sense.
I would recommend reading Fred Picker's The Zone VI Workshop first, then start slogging through Adams.
slogging through it is a great description !
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