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.
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