10 books • 3 series
The Complete Adventures of Richard Knight, Volume 3 (Richard Knight, #3)
The Complete Adventures of Eric Trent, Volume 2 (Eric Trent, #1)
Dr. Yen Sin #3 (Dr. Yen Sin, #3)
Dr. Yen Sin #2 (Dr. Yen Sin, #2)
The Complete Adventures of Eric Trent, Volume 1
Dr. Yen Sin #1
The Flying Saucers Are Real
Flying with Lindbergh
Aliens from Space
Flying Saucers from Outer Space