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1950 March, “Notes and News: Sugar Loaf Tunnel, Central Wales Line”, in Railway Magazine, page 209:
The tunnel, which is 1,000 yd. long, had been closed to passenger traffic since November 17, 1949, after some of the keystones had worked loose.
Something on which other things depend for support.
1999, Eliezer Geisler, Methodology, Theory, and Knowledge in the Managerial and Organizational ...:
Tension between empirical and theoretical knowledge is keystone to sociological and to organizational theories, as early as in Marx's and Weber's frameworks.
A native or resident of the American state of Pennsylvania.
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