Scope and Contents From the Sub-Series: This subseries includes Employees' Aid Fund registration cards from the Baltic Mining Company, Champion Copper Company, and Copper Range Company. Cards are highly incomplete, especially for Baltic.Champion and Copper Range registration cards are filed together by employee number. To find employee numbers, consult the payrolls in Series IV: Financial Records. Note that employee numbers were reused and were changed if the employee transferred to a new shaft or shop....