Indians of North America 231 Law and legislation 184 Public lands 140 History 133 Land tenure 123 Bridges 98 Claims 86 Indigenous peoples 66 Topographical surveying 65 Irrigation 63 Legal status, laws, etc 60 National parks and reserves 56 Harbors 54 General 50 Legal status 49 HISTORY 41 Expenditures, Public 39 Environmental aspects 37 Flood control 37 Land titles 36 Public buildings 36 Registration and transfer 36 Military bases 35 Boundaries 34 Fishes 34 Historic sites 33 State & Local 32 Water resources development 31 Law 30 Reservoirs 30