TY - RPRT TI - Volcanic stratigraphy and alteration mineralogy of drill cuttings from EWEB 4 drill hole, Clackamas County, Oregon AU - Terry E. Keith AU - James R. Boden PY - 1980 DO - 10.3133/ofr80891 UR - https://pubs.usgs.gov/publication/ofr80891 ID - ofr80891 ER -