Riddles
Free to read here, from Project Gutenberg.
The Canterbury Puzzles, and Other Curious Problems
Puzzles and oddities
Conundrums, Riddles and Puzzles
How to Solve Conundrums
The Santa Claus' Book of Games and Puzzles
The Handbook of Conundrums
At the Sign of the Sphinx. Second series
Classical Enigmas, Adapted to Every Month in the Year
The Riddle Club at Sunrise Beach
Patty's Motor Car
Nuts to crack: A galaxy of puzzles, riddles, conundrums, etc.
