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The binary data are available via anonymous FTP from the National Strong Ground Motion FTP-server:
ftp://smftp.wr.usgs.gov in directory GEOS/UPL.
For information on these recordings refer to USGS Open-File Report 91-47: Waveform Data from Aftershocks of the 1990 Upland, California, Earthquake Recorded on a Small Aperature Seismic Array; by Jim Mori and Christopher Dietel; 47 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/UPL/upland.html
e-mail: glassmoyer@usgs.gov
or address:
Gary Glassmoyer
345 Middlefield Road M/S 977
Menlo Park, California 94025