TY - RPRT TI - Discussions and recommendations from the workshop on Impacts of volcanic Ash on Airport Facilities, Seattle, Washington, April 26-28, 1993 AU - T. J. Casadevall PY - 1993 DO - 10.3133/ofr93518 UR - https://pubs.usgs.gov/publication/ofr93518 ID - ofr93518 ER -