The Civil War
EA
The Clean-Up Crew
BC
The Clean-Up Crew
BH
The Coeur D'Alene Puzzle Book
BC
The Colorado Springs Puzzle Book
BC
The Construction Crew
BC
The Construction Crew
BH
The Curious Kid's Science Book
BC
The Curious Kid's Science Book
EA
The Denver Puzzle Book
BC
The Doctor with an Eye for Eyes
BB