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The study describes the information obtained by contacting over seventy firms that were active in Bering Sea exploration as either lease operators or service contractors for the 1980 through 1984 period. Pre-lease exploration activities included regional marine seismic surveys, high-resolution geophysical surveys, geological surveys, airborne geophysical surveys, and the installation and operation of navigation systems. Drilling activities included drilling vessel operations, marine and air support services and bases, lease operator supervision, and the services provided by numerous specialized contractors such as mud loggers and divers. Employment and expenditure data were obtained for all pre-lease and post-lease exploratory drilling activities. Almost 4000 person years of employment were required, approximately 510 person years were to Alaska residents.