TY - RPRT TI - Reflectance increase from broad beam ion milling of coals and organic-rich shales due to increased surface flatness AU - Brett J. Valentine AU - Paul C. Hackley AU - Javin J. Hatcherian AU - Jing-Jiang Yu PY - 2019 DO - 10.1016/j.coal.2018.11.004 UR - https://pubs.usgs.gov/publication/70208397 ID - 70208397 ER -