TY  - RPRT
TI  - The initial giant umbrella cloud of the May 18th, 1980, explosive eruption of Mount St. Helens
AU  - R. S. J. Sparks
AU  - J.G. Moore
AU  - C.J. Rice
PY  - 1986
UR  - https://pubs.usgs.gov/publication/70015660
ID  - 70015660
ER  -