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Links:
- Teacher's guides and materials
- Walkway over the Hudson
- Explore NY 400
- Hudson River Maritime Museum
- Newburgh Beacon Bay 2009
- Ulster County Quad Committee
- Columbia County HFC Quadricentennial Committee
- Albany County Convention and Visitors Bureau Hudson 400 site
- Henry Hudson 400 Foundation (New York City-Amsterdam celebration)
- Lake Champlain Quadricentennial Commission
- Lake Champlain Maritime Museum
