In Depth Directional Drilling is also listed under the following categories: Standard Yellow Pages Heading (SYPH) Categories:

• Drilling Contractors
• Trenching Contractors
• Utility Contractors
• Contractors Drilling Core
• Underground Utilities Contractors

North American Industry Classification System (NAICS) Categories:

• Water And Sewer Line And Related Structures Construction > Underground Construction
• Power And Communication Line And Related Structures Construction
• Site Preparation Contractors > Land Preparation Construction > Trenching Contractors
• All Other Specialty Trade Contractors > Pumping & Drilling Contractors > Drilling Core Contractors
• All Other Specialty Trade Contractors > Well Drilling Contractors

Standard Industry Classification (SIC) Categories:

• Constructing Water, Sewer, Power, & Communication Lines And Pipelines > Utility Contractors
• Heavy Construction, Nec > Land Preparation Construction > Trenching Contractors
• Special Trade Contractors, Nec > Pumping & Drilling Contractors > Drilling Core Contractors