Heavy Construction, NEC (23,397)
Athletic Field Construction (71)
Blasting Contractor, Except Building Demolition (393)
Chemical Plant and Refinery Construction (127)
Construction-Heavy Projects (4,543)
Dams, Waterways, Docks, and Other Marine Construction (576)
Earthmoving Contractor (1,311)
Golf Course Construction (690)
Heavy Construction (Unclassified) (45)
Industrial Plant Construction (333)
Irrigation System Construction (526)
Land Clearing Contractor (2,204)
Land Preparation Construction (1,340)
Mine Loading and Discharging Station Construction (27)
Oil Refinery Construction (133)
Railroad and Subway Construction (167)
Tennis Court Construction (484)
Tracks and Athletic Fields Construction (141)
Trenching and Underground Contractors (1,239)