Dr WILLIAM WOLF was a dentist for twenty-two years before retiring at the age of 45 to pursue his aviation interests and outdoor pastimes. Over the past forty-five years he has amassed an archive of over 27,000 books and magazines, 10,000 or more images, and hundreds of reels of microfilm, among other material, on the subject. He is the author of twenty-four books on aerial warfare in the Second World War, including nine on American bombers, two on US fighters, five on American flying units, and three volumes on US aerial armament.