Ruger, Henry A. 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. New York: The Science Press, 1910.
Reference
- Object[2]
- no[2]
- historic[2]
- puzzle[2]
- reproduction[1]
- 19th century[1]
- modern[1]
- americana[2]
- new york[1]
- new york city[1]
- yes[2]
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