RT Article T1 Walking Away from Chaco Canyon: Gift-Giving, Trust, and Environmental Decision Making in a Pre-State Urban Society JF Environmental ethics VO 40 IS 2 SP 153 OP 172 A1 Matteson, Jason LA English PB Center for Environmental Philosophy, University of North Texas YR 2018 UL https://ixtheo.de/Record/1697858708 DO 10.5840/enviroethics201840215