TY - RPRT TI - Fischer assays of oil shale drill cores and rotary cuttings from the Piceance Basin, Colorado— 2009 update AU - Tracey J. Mercier AU - Michael E. Brownfield AU - Ronald C. Johnson AU - Jesse G. Self PY - 1998 DO - 10.3133/ofr98483 UR - https://pubs.usgs.gov/publication/ofr98483 ID - ofr98483 ER -