Law and legislation 408 Registration and transfer 104 Land titles 102 National parks and reserves 54 Boundaries 50 Water resources development 50 Historic sites 49 more ... Indians of North America 36 Finance 33 Legal status, laws, etc 31 Public lands 30 Land tenure 27 Water 21 Appropriations and expenditures 20 Research 20 Fishery law and legislation 19 Indian land transfers 19 Water reuse 19 Expenditures, Public 17 Management 17 Endangered species 16 Wilderness areas 16 Indiens d'Amérique 15 Wildlife conservation 15 Claims 14 Wildlife refuges 14 Conservation 13 Government policy 13 Real property, Exchange of 12 Protection 11 less ...