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List of areas in the United States National Park System - Wikipedia
Oregon National Historic Trail
Feasibility Study - Oregon National Historic Trail (U.S. National
Explore Lewis & Clark Trail: Legendary Journey
National Historic Oregon Trail Interpretive Center
National Historic Trails - National Trails System (U.S. National
Park Archives: Oregon National Historic Trail
America's National Trails System - Pacific Crest Trail Association
America's Greatest National Historic Trails: Scenic Routes in the