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Three seismic refraction profiles will be shot in central Alaska in 1987 by the U.S. Geological Survey (USGS) as a continuation of work on the USGS Trans-Alaska Crustal Transect (TACT) project. USGS invites interested parties to collaborate in recording the explosions in this experiment. In addition, seismic refraction data collected in 1984 by USGS in southern Alaska are now available, to be followed soon by the data from 1985.