THIS IS A HARDY AND HARDY INVESTIGATIONS. I PURCHASED IT OFF ETSY SOME TIME BACK TO CATALOG MY HARDY BOYS COLLECTION. GREAT TOOL TO HELP FIND THE VALUE AND EDITION, I FOUND I HAD SEVERAL 1ST EDITIONS I DIDN'T EVEN KNOW I HAD. I HAD IT SPIRAL BOUND TO CLEAN IT UP AND PUT IT INTO TWO VOLUMES BECAUSE OF THE SIZE, 516 PAGES SIZE. GOOD CONDITION, FOURTH EDITION. GOOD DEAL COMPARED TO SOME OUT THERE. ANY QUESTIONS PLEASE ASK. SHIPPING IS $6 FLAT. THANKS FOR LOOKING.