TY - RPRT TI - U.S. Geological Survey 2002 petroleum resource assessment of the National Petroleum Reserve in Alaska (NPRA): GIS play maps AU - Christopher P. Garrity AU - David W. Houseknecht AU - Kenneth J. Bird PY - 2002 DO - 10.3133/ofr02439 UR - https://pubs.usgs.gov/publication/ofr02439 ID - ofr02439 ER -