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Subject
- Historic buildings899
- Conservation and restoration512
- Historic sites217
- Architecture142
- History101
- Historic preservation97
- Architecture, Domestic61
- Law and legislation54
- Buildings49
- United States45
- Protection44
- Cultural property38
- Dwellings31
- Federal aid to historic sites30
- Maintenance and repair29
- Monuments27
- National parks and reserves26
- National Register of Historic Places25
- Remodeling for other use25
- History, Local24