Hlj definitions

hlj

exploration seismology; seismic survey(s)
Found on http://pubs.usgs.gov/of/1995/of95-807/geoicelandic.html

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hlj

seismic reflection(s)
Found on http://pubs.usgs.gov/of/1995/of95-807/geoicelandic.html

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hlj

seismic refraction(s)
Found on http://pubs.usgs.gov/of/1995/of95-807/geoicelandic.html

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