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Subclass HE
| HE1-9990 | Transportation and communications | |||
| HE199-199.5 | Freight (General) | |||
| HE199.9 | Passenger traffic (General) | |||
| HE305-311 | Urban transportation | |||
| HE323-328 | Transportation geography. Trade routes | |||
| HE331-380 | Traffic engineering. Roads and highways. Streets | |||
| HE369-373 | Traffic surveys (General) | |||
| HE374-377 | Bridges | |||
| HE379-380 | Tunnels. Vehicular tunnels | |||
| HE380.8-971 | Water transportation | |||
| HE380.8-560 | Waterways | |||
| HE561-971 | Shipping | |||
| HE730-943 | Merchant marine. Ocean shipping. Coastwise shipping | |||
| HE1001-5600 | Railroads. Rapid transit systems | |||
| HE5601-5725 | Automotive transportation Including trucking, bus lines, and taxicab service | |||
| HE5746-5749 | Stage lines | |||
| HE5751-5870 | Ferries | |||
| HE5880-5990 | Express service | |||
| HE6000-7500 | Postal service. Stamps. Philately | |||
| HE7511-7549 | Pneumatic service | |||
| HE7601-8700.9 | Telecommunication industry. Telegraph | |||
| HE8660-8688 | Wireless telegraph. Radiotelegraphy | |||
| HE8689-8700.95 | Radio and television broadcasting | |||
| HE8701-9680.7 | Telephone industry | |||
| HE9713-9715 | Cellular telephone services industry. Wireless telephone industry | |||
| HE9719-9721 | Artificial satellite telecommunications | |||
| HE9723-9737 | Signaling | |||
| HE9751-9756 | Messenger service | |||
| HE9761-9900 | Air transportation. Airlines | |||
