Here are a few of the ones I have. Most, but not all sit above my fly tying desk. There are a few in various places in my house that I am actively reading. The George Daniels book Strip Set is one. I also have Rare and Unusual Fly Tying Materials Vol 1 (still looking for Vol 2) The one I am holding is one of my favorite, even though I do not tie classic flies much. I was taught how to tie by a neighbor when I was a kid. He left me some books when he passed, and Forgotten Flies was among them.
I do a lot of reading, and I am fortunate that the Carnegie Library of Pittsburgh has a pretty nice collection thanks to the PWWTU and others. It is worth checking out the library before buying. A couple on the shelf are from the library and are in the reading queue...
Edited to add a couple that were not pictured but worth mentioning: Modern Streamers for Trophy Trout by Linesman and Galloup and Guide Flies by Klausmeyer.