Puzzles
Free to read here, from Project Gutenberg.
Amusements in Mathematics
Minute Mysteries [Detectograms]
The Canterbury Puzzles, and Other Curious Problems
Twentieth Century Standard Puzzle Book
The puzzle king
Pictured Puzzles and Word Play
Conundrums, Riddles and Puzzles
500 Rätsel und Rätselscherze für jung und alt
The cross word puzzle book: Second series
Merry's Book of Puzzles
The cross word puzzle book
The cross word puzzle book: Third series
Bright-Wits, Prince of Mogadore