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| Only Movies by David Friedman | X |
| Only DVDs Published in 1940 - 1949 | X |
 | | Conceptual and Statistical Issues in Contingent Valuation Estimating the Value of Altered Visibility in the Grand Canyon with Daniel S. Levy, David Friedman, James K. Hammitt, Naihua Duan, Theo Downes-Leguin Paperback, 39 Pages, Published 1940 by Rand ISBN-13: 978-0-8330-1500-6, ISBN: 0-8330-1500-1 |