Concept
Puzzles
Images
Catalogue
- Books
Beat Alzheimer's with puzzles / Kalman Toth, M.A., M. Phil.
Toth, Kalman (Computer scientist)Date: [2016]
- Ephemera
- Online
Dr. Worthington's "Cholera and Diarrhoea Medicine" : the great animal puzzle.
Date: [between 1889 and 1905?]- Books
The psychology of efficiency : an experimental study of the processes involved in the solution of mechanical puzzles and in the acquisition of skill in their manipulation / by Henry A. Ruger.
Ruger, Henry Alford, 1872-1947.Date: 1910