TY - RPRT TI - Accretionary lapilli in altered tuffs associated with coal beds AU - B.F. Bohor AU - Don M. Triplehorn PY - 1984 DO - 10.1306/212f8409-2b24-11d7-8648000102c1865d UR - https://pubs.usgs.gov/publication/70013180 ID - 70013180 ER -