With the initial hint of being a MacFadden book, this book title was found using the AbeBooks website and searching by year. It was very satisfying to find this listed in 1968, as finding a book with only its artwork would seem an impossible task. But here it is!
After a beginning search for the title in used bookstores, it was ultimately purchased from AbeBooks. And posted here for your enjoyment.
MacFadden Books have now been added to the publisher search list for more Pfeiffer covers, dating from the late sixties to very early seventies.