I have several old books in mint condition and would like to sale them is there any place that would buy them?

The books that I have are mostly 1950's editions of Random House. Educational and Factual with some historical. All are hardback covered, no riped pages and are in excellent condition. I also have a complete set of Colliers Encyclopedias. With bonus books from the late 50's to early 60's these too are in excellent condition. I hope someone out there has the answer for me I would like to see them go to someone that appreciates fine old books.