Give it away now
I'm a sucker for knitting books. Whenever we have our umpteenth conversation about moving, I pretty much know what I can part with and what I can't. My knitting books stay!
I try to abide by the rule of giving away one item for each new one purchased. It helps cut down on too much accumulation.
Our local library has a used book shop inside and every so often I'll just pop in and browse. I saw these two gems and couldn't turn them down, especially since they were 2 bucks each.
I just donated a bunch of books to the book shop, including some knitting books I haven't looked at in years. Feels good.