• Vintage Hardy boys books Franklin W Dixon hardcover mystery lot of 4 13,15,17,19
• the mark on the door vol 13 dated 1967
• the sinister signpost vol15 dated 1968 >>> some writing on second page
• the secret warning vol17 dated 1966>>> some writing on second page
• the disappearing floor vol 19 dated 1964 
• Volumes 13,15,17,19 Hardy boys series by Franklin W Dixon
• lot of 4 books publishers Grosset and Dunlap