A: General Engineering
B: General Building
C-2: Insulation and Acoustical
C-4: Boiler, Hot Water Heating and Steam Fitting 
C-5: Framing and Rough Carpentry
C-6: Cabinet, Millwork and Finish Carpentry
C-7: Low Voltage Systems
C-8: Concrete
C-9: Drywall
C10: Electrical
C11: Elevator
C12: Earthwork and Paving
C13: Fencing
C15: Flooring and Floor Covering
C16: Fire Protection
C17: Glazing
C21: Building Moving/Demolition
C23: Ornamental Metal
C27: Landscaping
C28: Lock and Security Equipment
C29: Masonry
C31: Construction Zone Traffic Control
C32: Parking and Highway Improvement
C33: Painting and Decorating
C34: Pipeline
C35: Lathing and Plastering
C36: Plumbing
C38: Refrigeration
C39: Roofing
C42: Sanitation System
C43: Sheet Metal
C45: Electrical Signs
C46: Solar
C47: General Manufactured Housing
C50: Reinforcing Steel
C51: Structural Steel
C53: Swimming Pool
C54: Ceramic and Mosaic Tile
C55: Water Conditioning
C57: Water Well Drilling
C60: Welding
C61: Limited Specialty
ASB: Asbestos Certification
HAZ: Hazardous Substance Removal Certification

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