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[5]
- no[5]
- historic[5]
- puzzle[5]
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- france[2]
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- united states of america[2]
- 19th century[1]
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- the bowery[1]
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