Mount St. Helens volcanic-ash fall in the Bull Run watershed, Oregon, March-June 1980.  by M.V. Shulters and D.G. Clifton
Contributors: Clifton, D.G.
Publisher: U.S.  Dept. of the Interior
Place of publication: Washington
Language: eng
Number of pages: 15
Subjects: Mount St. Helens volcano
Notes: 11