TY - RPRT TI - Roberts rift, Canyonlands, Utah, a natural hydraulic fracture caused by comet or asteroid impact AU - Peter W. Huntoon AU - Eugene Merle Shoemaker PY - 2005 DO - 10.1111/j.1745-6584.1995.tb00311.x UR - https://pubs.usgs.gov/publication/70226688 ID - 70226688 ER -