Fort Union Trading Post, Williston, ND ID: 4980 | This file appears in: Fort Union Trading Post View of Fort Union trading post at sunset | Creator: Robert Harper, photographer. | Date: Oct 2014 | Source: Fort Union Trading Post gallery, National Park Service website. | Rights: Copyright Robert Harper Download Original File CreatorRobert Harper, photographer.SourceFort Union Trading Post gallery, National Park Service website.DateOct 2014RightsCopyright Robert Harper "Fort Union Trading Post, Williston, ND" appears in: Fort Union Trading Post