National parks and reserves 563 History 310 Historic sites 299 Management 195 Law and legislation 117 Trails 93 Antiquities 85 Conservation and restoration 85 Historic buildings 85 Appropriations and expenditures 71 Buildings 57 Public lands 57 Indians of North America 54 Roads 51 National monuments 49 Outdoor recreation 47 Homes 46 Homes and haunts 46 Buildings, structures, etc 45 Indigenous peoples 45 Budget 44 Planning 42 Government policy 37 Recreation areas 36 Concessions (Amusements, etc.) 35 Public contracts 33 Officials and employees 32 Fees 31 Landscape assessment 31 Environmental aspects 28