Each of the 2500+ National Historic Landmarks represents an outstanding aspect of American history and culture, whether a building, site, or district
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This directory provides a listing of NPS Arborists organized by state.
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The Technical Preservation Services (TPS) office of the National Park Service is responsible for historic preservation policy and guidance.
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The American Society for Environmental History increases awareness of current environmental issues by creating a context based in historical understanding.
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SGHS provides resources and educational opportunities in historic horticulture and in the preservation of historic gardens and landscapes.
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The Cultural Resource Geographic Information Systems Facility (CRGIS) uses GIS and GPS technologies in documenting and managing cultural resources.
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The American Battlefield Protection Program promotes the preservation of significant historic battlefields associated with wars on American soil.
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The Civil War Trust is a non-profit organization devoted to the preservation of America's endangered Civil War battlefields.
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