A

Heavy Construction, NEC

Athletic Field Construction

Blasting Contractor, Except Building Demolition

Builders Docks

Canal Construction

Chemical Plant and Refinery Construction

Construction-Heavy Projects

Dams, Waterways, Docks, and Other Marine Construction

Drainage Contractors

Dredging

Earthmoving Contractor

Erosion Control

Flood Control Equipment

Golf Course Construction

Heavy Construction (Unclassified)

Industrial Plant Construction

Irrigation System Construction

Land Clearing Contractor

Land Leveling

Land Preparation Construction

Land Reclamation

Marine Contractors

Mine Loading and Discharging Station Construction

Oil Field Contractors

Oil Refinery Construction

Pile Driving

Ponds and Pond Supplies

Power Plant Contractors

Railroad Contractors

Railroad and Subway Construction

Rock Removal

Subway Construction

Tennis Court Construction

Timber Removal

Tracks and Athletic Fields Construction

Trenching and Underground Contractors

Waste Disposal Plant Construction

Water Pollution Control

Waterway Construction