1:500K USGS map State of Wash. (1961, rev. 1982)
1973
--
1983
--
1988
--
1992
--
1996
![[a map]](MtStHelensinmap.gif)
1:500K USGS map State of Wash. (1961, rev. 1982)
1973
-- 1983
-- 1988
-- 1992
-- 1996