TY - BOOK AU - Bjornstad David J AU - Kahn James R TI - Contingent valuation of environmental resources: methodological issues and research needs SN - 1-85898-321-5 U1 - 363.7 PY - 1998/// CY - Cheltenham PB - Edward Elgar KW - Conservation of natural resources-research KW - Contingent valuation KW - Environmental policy ER -