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Cover: Oblique aerial view southward of the Mono Craters in eastern California. Mono Lake is in the foreground; Long Valley Caldera and the Sierra Nevada are in the distant background. The Mono Craters are an arcuate chain of rhyolite volcanic domes that have formed by eruptions during the past 40,000 years.

UNIVERSITY -QF MINNESOTA
UtPOSITORY PUBN.
U.S.-G.RO.-D-301-A

APR i4 ]983

DOCUMENTS
ST. PAUL CAMPUS LIBRARIES

United

States

Geological

Survey

Yearbook,

Fiscal

Year

1982

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