Ahoj Kate,
That's an accurate description of Adams' books. They are extremely detailed in information and illustrate many points with good reproductions of photographs. Adams' writing style can be somewhat difficult. The editions written in the 1960s (5 volumes) are rather difficult to read, but the 1980s editions (3 volumes, which is what you seem to be looking at) are much better edited.
I don't know how much you will have to pay, but they were very worthwhile to me. I've gone back to them for 20-years now. Although, I must say, at the time I bought them there was no Internet and no APUG. The Adams books and Fred Picker's newsletter were just about the only serious sources of information for B&W and large format. A lot of what's in the Adams books is online now, but the books are more concise and organized, and are probably still worthwhile.
juan