Quarries and quarrying Public lands 6 Claims 5 Antiquities 4 Forest reserves 4 Indians of North America 4 Indigenous peoples 3 Industries 3 Land tenure 3 Lumber 3 Mines and mineral resources 3 Mining leases 3 Tariff 3 Budget 2 Canals 2 Excavations (Archaeology) 2 Geology 2 History 2 International trade 2 Law and legislation 2 Limestone 2 Military bases 2 Mining engineering 2 National monuments 2 Seashore 2 Washington Monument (Washington, D.C.) 2 Water-power 2 Abrasives 1 Bridges 1 Bronze age 1