1
Published: 2013.
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2
Published: 2017.
Superior document: Hoover Institution Press publication ; no. 679
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3
Published: 1989.
Superior document: A National Bureau of Economic Research conference report
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4
Published: c1993.
Superior document: A National Bureau of Economic Research project report
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5
Published: c1998.
Superior document: A National Bureau of Economic Research project report
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6
Published: c1984.
Superior document: A Conference report / National Bureau of Economic Research
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7
Published: 2005,, c2003.
Superior document: National Bureau of Economic Research conference report
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