A

Heavy Construction, NEC (23,397)

Athletic Field Construction (71)

Blasting Contractor, Except Building Demolition (393)

Builders Docks (783)

Caisson Drilling (82)

Canal Construction (21)

Chemical Plant and Refinery Construction (127)

Construction-Heavy Projects (4,543)

Cutting of Right-Of-Way (40)

Dam Construction (76)

Dams, Waterways, Docks, and Other Marine Construction (576)

Ditching Contractors (28)

Dockboards and Ramps (9)

Drainage Contractors (887)

Dredging (331)

Earthmoving Contractor (1,311)

Erosion Control (308)

Fill Contractors (59)

Fish Pools (16)

Flood Control Equipment (51)

Golf Course Construction (690)

Harbor Construction (37)

Heavy Construction (Unclassified) (45)

Industrial Plant Construction (333)

Irrigation System Construction (526)

Land Clearing Contractor (2,204)

Land Leveling (545)

Land Preparation Construction (1,340)

Land Reclamation (222)

Levee Construction (46)

Marine Contractors (2,092)

Mine Loading and Discharging Station Construction (27)

Oil Field Contractors (65)

Oil Refinery Construction (133)

Pier Construction (46)

Pile Driving (341)

Ponds and Pond Supplies (607)

Power Plant Contractors (320)

Railroad Contractors (745)

Railroad and Subway Construction (167)

Rock Removal (98)

Sea Wall Contractors (23)

Soil Solidification (7)

Soil Stabilization (8)

Subway Construction (18)

Tennis Court Construction (484)

Timber Removal (247)

Tracks and Athletic Fields Construction (141)

Trenching and Underground Contractors (1,239)

Waste Disposal Plant Construction (156)

Water Pollution Control (602)

Water Works Contractors (28)

Waterway Construction (103)