In reply to chris Norman:
> We are about to down size homes and things must go. I have a collection of old Climbing guides & mountaineering books which some were my fathers and an Uncle. The guides are all about 1950's and some 70's. The mountaineering books start at about 1938 up until 1981, I think. I'm not sure what to with them or where I could sell them on. Any advise would be helpful.
My suggestion would be to contact some of the specialist mountain book sellers. They might be interested in buying some/all of the books themselves, or otherwise might provide guidance, or suggest reasonable valuations.
Here are two, for a start:
https://www.glacierbooks.com/page/books-wanted
https://mountainbooks.co.uk/index.html