| 1. AirNav.Com
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| Listing of airports by city. Includes location and map, operations, services, communication aids, navigation and runway details, and contacts. |
| http://www.airnav.com/airports/us/WA |
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| 2. Highways of Washington State
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| The State highway system, with emphasis on the history of various route numbers used over time. |
| http://www.angelfire.com/wa2/hwysofwastate |
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| 3. NEXUS
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| A joint customs and immigration program for frequent travellers that both the Canadian and American governments have implemented. |
| http://www.getnexus.com |
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| 5. Washington State Ferries
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| Schedules, fares, route maps, fleet guide, news and travel information. |
| http://www.wsdot.wa.gov/ferries |
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| 7. Washington State Transportation Commission
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| Serves as the board of directors of the Department of Transportation, providing oversight to ensure the Department delivers quality transportation facilities and services in a cost-effective manner. |
| http://www.wstc.wa.gov |
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| 8. Washington Trucking Association
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| A nonprofit corporation whose purpose is protecting and promoting the interests of all segments of Washington's trucking industry. |
| http://www.wtatrucking.com |
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