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Overarching Problems » American Scientist

How the keystone “motif” is used in contexts other than construction (e.g. Penn state logo)

http://www.americanscientist.org/issues/pub/overarching-problems November-December 2012
Volume 100, Number 6
Page: 458
DOI: 10.1511/2012.99.458
Overarching Problems
Keystones, whether employed to complete an arch or as a metaphor, require care in their use
Henry Petroski

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