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For information on these recordings refer to USGS Open-File Report 86-330: Preliminary Report on High-Frequency Near-Source Recordings at Permanente Rock Quarry in Cupertino, California; by Christopher Dietel, 52 pages.
The GEOS Home Page is at http://nsmp.wr.usgs.gov/GEOS/geos.html
The URL of this page is http://nsmp.wr.usgs.gov/GEOS/PERM/perm.html
e-mail: glassmoyer@usgs.gov
or address:
Gary Glassmoyer
345 Middlefield Road M/S 977
Menlo Park, California 94025