?url_ver=Z39.88-2004&rft_id=10.1146%2Fannurev.resource.012809.103949&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aulast=Cropper&rft.aufirst=Maureen&rft.volume=3&rft.date=June+2011&rft.atitle=Valuing+Mortality-Risk+Reductions%3A+Progress+and+Challenges&rft.title=Annual+Review+of+Resource+Economics&rft.pages=313-336&rft.genre=article