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Source:
Washington Monthly. Sep/Oct2022, Vol. 54 Issue 9/10, p112-118. 5p. 1 Chart.
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Source:
New Scientist. 5/18/2013, Vol. 218 Issue 2917, p19-19. 1/2p.
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Source:
ENR: Engineering News-Record. 9/28/2020, Vol. 285 Issue 7, p26-27. 2p. 2 Charts, 4 Graphs.
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