Eleventh Annual Chacmool Conference No description specified. 1-2 (2 Records) Documents Aerial Photogrammetry of Stone Circles and Piled-Stone Alignments At the Ulm Pishkun State Monument, Montana. In Megaliths To Medicine Wheels: Boulder Structures In Archaeology (1991) Megaliths To Medicine Wheels: Boulder Structures In Archaeology (1980)