Hi, Susan - you pose an interesting question. Yes, I have seen some of those records. It was years ago in a library book sale, and I resisted the temptation to buy them.
As you've seen, we have two threads on the booklets by Cooperative Recreation Service / World Around Songs:
As stated in both threads, the American Folklife Center of the Library of Congress has possession of the records of World Around Songs, which is still in business. My acquaintances there are Jennifer Cutting and Steve Winick, and both of them would be happy to talk with you about what's available.
Joe Offer, Music Editor, The Mudcat Cafe