Interesting Ex-Library Edition Hardy Boys #4 The Missing Chums 1962

Very interesting ex-library copy of the Missing Chums! It even still includes the library check-out card dating back to 1966! How cool. It also makes note of edition being different than the other (original) version. The author did update the police procedures and it was noted in the front pages. All stamps and writing were made by library. Sold as found. An interesting copy for your collection!