- Dams, waterways, docks, and other marine construction (98)
- Caisson drilling (2)
- Canal construction (3)
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- Drainage system construction (67)
- Dredging contractor (67)
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- Railroad and subway construction (4)
- Railroad and railway roadbed construction (17)
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- Golf course construction (121)
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- Blasting contractor, except building demolition (14)
- Earthmoving contractor (91)
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- Trenching contractor (58)
