Annual Capital Expenditures
C 3.289:
Career Guide to Industries
L 2.3/4-3:
Economic Census (1997): Mining: Industry Series
C 3.277:
North American Industry Classification System: United States, 1997
PREX 2.6/2:IN 27/997/
Occupational Outlook Handbook
L 2.3/4:
REIS: Regional Economic Information System
C 59.24:
Standard Industrial Classification Manual 1987
PREX 2.6/2:IN 27/987
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