Most thrift stores and second hand stores won't take old Encyclopedia. No one wants them. However, you may find someone you can give them to who will use them for a craft or art project. Some people make lamps out of them, for example.
I don't think you will find that your 1956 Britannica book set is of much value, every thing is so out dated. I do volunteer work in a thrift shop and we get this type of old books all the time, they hardly ever sell. Check with your local book store, they might be able to help you.
Eileen H
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