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- Harper's Ferry (W. Va.)--History--John Brown's Raid, 1859.5
- Harper's Ferry National Historical Park--History.5
- Harper's Ferry National Historical Park--Maps.5
- Harper's Ferry National Historical Park.5
- Battlefields--Pennsylvania.4
- Chesapeake and Ohio Canal National Historical Park.4
- Fort Necessity National Battlefield (Pa.)4
- Canals--Maryland.3
- Canals--Washington (D. C.)3
- Canals--West Virginia.3
- Chesapeake and Ohio Canal (Md. and Washington, D. C.)3
- Antietam National Battlefield (Md.)2
- Battlefields--Pennsylvania--Study and teaching (Elementary)2
- Fort Necessity National Battlefield (Pa.)--Study and teaching (Elementary)2
- New River Gorge National River (W. Va.)--Description and travel.2
- America's Industrial Heritage Project.1
- Battlefields--Maryland.1
- Battlefields--Pennsylvania--Maps.1
- Bluestone National Scenic River (W. Va.)1
- Brown, John, 1800-1859.1
- Fort Necessity National Battlefield (Pa.)--Maps.1
- Fredericksburg and Spotsylvania County National Military Park (Va.)1
- Gauley River National Recreation Area (W. Va.)1
- Gettysburg National Military Park (Pa.)1
- Gettysburg National Military Park (Pa.)--Maps.1
- Historic buildings--Conservation and restoration--United States.1
- Historic sites--Conservation and restoration--Pennsylvania.1
- Hopewell Culture National Historical Park (Ohio)--Periodicals.1
- Hopewell culture--Ohio--Periodicals.1
- Industrial sites--Pennsylvania.1
- Mound-builders--Ohio--Periodicals.1
- National parks and reserves--West Virginia.1
- New River Gorge National River (W. Va.)1
- Ohio--Antiquities.1
- United States. National Park Service. Harpers Ferry Center.1
- Harper's Ferry (W. Va.)--History--John Brown's Raid, 1859.5
- Harper's Ferry National Historical Park--History.5
- Harper's Ferry National Historical Park--Maps.5
- Harper's Ferry National Historical Park.5
- Chesapeake and Ohio Canal National Historical Park.4
- Fort Necessity National Battlefield (Pa.)4
- Chesapeake and Ohio Canal (Md. and Washington, D. C.)3
- Antietam National Battlefield (Md.)2
- Fort Necessity National Battlefield (Pa.)--Study and teaching (Elementary)2
- New River Gorge National River (W. Va.)--Description and travel.2
- Bluestone National Scenic River (W. Va.)1
- Fort Necessity National Battlefield (Pa.)--Maps.1
- Fredericksburg and Spotsylvania County National Military Park (Va.)1
- Gauley River National Recreation Area (W. Va.)1
- Gettysburg National Military Park (Pa.)1
- Gettysburg National Military Park (Pa.)--Maps.1
- Hopewell Culture National Historical Park (Ohio)--Periodicals.1
- New River Gorge National River (W. Va.)1
- Ohio--Antiquities.1
- Battlefields--Pennsylvania.4
- Canals--Maryland.3
- Canals--Washington (D. C.)3
- Canals--West Virginia.3
- Battlefields--Pennsylvania--Study and teaching (Elementary)2
- Battlefields--Maryland.1
- Battlefields--Pennsylvania--Maps.1
- Historic buildings--Conservation and restoration--United States.1
- Historic sites--Conservation and restoration--Pennsylvania.1
- Hopewell culture--Ohio--Periodicals.1
- Industrial sites--Pennsylvania.1
- Mound-builders--Ohio--Periodicals.1
- National parks and reserves--West Virginia.1
- United States. National Park Service.✖[remove]32