I got my start with the Webb Society and their publications back in the late '70's with the Deep-Sky Observer's Handbooks. All of them are still great resources today - and I don't think there has ever been another book done on Clusters of Galaxies (Volume 5)*.
* Except for maybe Alvan Huey's Faint Fuzzies guides.
I agree Brent, I am glad I was able to get all 8 of the Deep-Sky Observers Handbooks and I do thumb through them frequently. I own several of Alvin's books in spiral bound and have downloaded what I could to my observing tablet good read while waiting for it to get dark.
I have been thinking about ordering more books from the Webb Society, especially the atlases and considered ordering the GOM. Funny thing was that I didn't order it because it only covers up to a certain date and the GOM is still going on so the book is dated when you get it. LOL Just my weird quirks.