Law and legislation 35 Land titles 12 Registration and transfer 12 National parks and reserves 11 Historic sites 7 Real property, Exchange of 7 Water resources development 6 más ... Finance 5 Natural resources conservation areas 5 Biens réels 4 Boundaries 4 Échange 4 Water-supply 4 Approvisionnement 3 Eau 3 Groundwater 3 Natural areas 3 Research 3 Appropriations and expenditures 2 Aquifers 2 Aquifères 2 Collection and preservation 2 Endangered species 2 Indians of North America 2 Management 2 Rare fishes 2 Wilderness areas 2 Antiquités 1 Antiquities 1 Atomic bomb 1 menos ...