TY - RPRT TI - Helicopter electromagnetic and magnetic survey maps and data, East Poplar oil field area, Fort Peck Indian Reservation, northeastern Montana, August 2004 AU - Bruce D. Smith AU - Joanna N. Thamke AU - Michael J. Cain AU - Christa Tyrrell AU - Patricia L. Hill PY - 2006 DO - 10.3133/ofr20061216 UR - https://pubs.usgs.gov/publication/ofr20061216 ID - ofr20061216 ER -