TY - RPRT TI - Occurrence and geochemistry of natural gases, Piceance Basin, northwest Colorado AU - Ronald C. Johnson AU - Dudley D. Rice PY - 1990 DO - 10.1306/0c9b2399-1710-11d7-8645000102c1865d UR - https://pubs.usgs.gov/publication/70015947 ID - 70015947 ER -