Map of Judith Basin, Montana Ter. / Northern Transcontinental Survey, Raphael Pumpelly, director ; Department of Topography, A.D. Wilson, chief topographer.1882In bottom margin: Photolithographed preliminary sheet for the use of the parties in the field and subject to revision.In top margin: SoutherLibrary's copy separated into two sheets (76 x 43 cm. and 76 x 59 cm.)Relief shown by contours and spot heights.cartographic