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Re geologic mapping of California: there is almost an
embarrasse de richesse when it comes to indexes to
look up what mapping is available.  The classic is the
USGS Geologic Map Index of California - the last I knew,
it was available free of charge from USGS Distribution
in Denver.  The California Division of Mines and
Geology has published numbers in the  Special Reports
series that are geologic map indexes.  And Joe Crotts at
Cal State Univ/Chico has an index by quad name,
in digital form; early versions of this were published
in the Information Bulletin of the Western Association
of Map Libraries.  Other responses to your request
may give specific addresses, etc. - I'm in another
office at the moment - if they don't, send a message
to me directly and I'll provide you with specifics.
Mary L. Larsgaard, Map & Imagery Lab, Library, UCSB
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