@book{MR-344-RC,
author="Levy, Daniel S. and James K. Hammitt and Naihua Duan and Theodore Downes-Le Guin and David B. Friedman",
title="Conceptual and Statistical Issues in Contingent Valuation: Estimating the Value of Altered Visibility in the Grand Canyon",
address="Santa Monica, CA",
year="1995",
doi="",
publisher="RAND Corporation"
}