National parks and reserves 563 History 308 Historic sites 297 Management 195 Law and legislation 117 Trails 92 Conservation and restoration 85 Historic buildings 85 Antiquities 84 Appropriations and expenditures 71 Buildings 57 Public lands 57 Indians of North America 53 Roads 51 National monuments 48 Homes 46 Homes and haunts 46 Outdoor recreation 46 Buildings, structures, etc 45 Indigenous peoples 45 Budget 44 Planning 42 Government policy 37 Concessions (Amusements, etc.) 35 Recreation areas 35 Public contracts 33 Officials and employees 32 Fees 31 Landscape assessment 31 Environmental aspects 28