Full Set of Classic Books, still packaged

I dont know if these books are worth any thing. They look like, maybe old school required reading? They are truely mint, They are still shrink wrapped.   They have been in a friends moms closet since 1970, the name of the collection is  "Best Loved Classics. The copyright is MCMXLIX. They were published by Book Production Industries Chicago. Ten books all together, All bright Blue. Iwould have to unwrap them to know more.