Conservation and restoration Historic sites 183 Historic buildings 128 History 83 Law and legislation 78 Antiquities 60 Architecture 57 Cultural property 56 Library materials 54 Protection 53 Buildings 52 Historic preservation 52 Buildings, structures, etc 42 Books 40 Monuments 30 Preservation 29 Management 25 Government policy 24 Indians of North America 24 Landscape protection 24 Collection and preservation 23 Finance 22 Archaeology 21 Archival materials 20 General 20 Indigenous peoples 20 Sacred space 20 Art 18 Homes and haunts 18 SOCIAL SCIENCE 17