I have what I believe is a complete set of books published by the John C. Winston Company, 1957-58. All are cloth bound, I have eleven: Arabian Nights, Pinocchio and Aesop's Fables, Andersen's Fairy Tales, Tales from Shakespeare, Robinson Crusoe, Tom Sawyer, Treasure Island, Robin Hood, Heidi, Black Beauty, and Alice in Wonderland.

If it is a complete set, then it is likely to be more valuable monetarily as a set, rather than if each book was priced individually and not being a part of the set. I hope that makes sense. The point being, that each book would be worth more individually because each of them would be part of a complete set.