Originally posted by grunermann:
•Sell your textbooks while they actually have value. When your collection gets out of hand, new editions will be out and your books will be worthless.•••
I suppose it depends on the what type of book it is. As far as I can tell, physics and chemistry have not changed all that much over the last 100 years. A good physics or chemistry book from 1965 can be just as valuable as one from 2001. Text books can be wonderful reference resources. Keeping them depends on if you like to keep a library of books or not. I move a lot so I tend not to keep a lot of books but I still have a set of physics, chemistry, organic chemistry, and biology books.