Die Kollektivmasslehre (1908) - Paperback
Cuber: How to Solve Various Puzzle Cubes Part I - Paperback
Cuber II: How to Solve Various Puzzle Cubes Part II - Paperback
Speedsolving the Cube: Easy-To-Follow, Step-By-Step Instructions for Many Popular 3-D Puzzles - Paperback
!Ah y Le Lo Lay, Le Lo Ley! Musica Tipica de Puerto Rico - Paperback
!Búscalo! (Look It Up!): A Quick Reference Guide to Spanish Grammar and Usage - Hardcover
!Búscalo! (Look It Up!): A Quick Reference Guide to Spanish Grammar and Usage - Paperback
!Eureka! - Hardcover