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The series relates to geophysical / seismic exploration on public lands. The records are organized by private company and each file may include correspondence, application, Seismic Exploration Inspection Report, final plan, cancellation, letter of clearance, process control detail, Geophysical Site Condition report, Confirmation of Extension Request, Geophysical Representation Letter, Timber Damage Rebate Audit Review, Final Geophysical Program Information, Timber Damage Assessment Calculation Sheet, Final Line Width Data Sheet, Avoidance Line Width Supplement Form, Program Completion Notice, reports, Geophysical Field Report, approval worksheet, maps, accounting information, and Preliminary Plan Information.