Geology 903 Mines and mineral resources 564 Alaska 312 Ore deposits 176 Geology, Stratigraphic 169 Forest management 162 Land titles Registration and transfer 133 Paleontology 133 Tongass National Forest (Alaska) 124 Gold mines and mining 99 Logging Environmental aspects 93 Geochemical prospecting 88 Alaska Description and travel 85 Earthquakes 83 National parks and reserves 76 Geochemistry 62 Geomagnetism 61 Petroleum 60 Public lands 60 Uranium ores 59 Glaciers 57 Water-supply 56 Petrology 55 National Petroleum Reserve (Alaska) 54 Land use 53 Volcanoes 53 Coal 52 Gold ores 50 Indian land transfers 50 Wildlife refuges 50 Forest reserves 46 Indians of North America Claims 45 Geology, Structural 43 Oil and gas leases 43 Water quality 43 Denali National Park and Preserve (Alaska) 42 Sediments (Geology) 41 Stream measurements 41 Arctic National Wildlife Refuge (Alaska) 40 Radioactive substances 40 Tongass National Forest (Alaska) Environmental conditions 38 Hydrology 37 Wildlife conservation 36 Alaska History 34 Petroleum Geology 34 Groundwater 33 Copper ores 32 Paleobotany 32 Climatic changes 31 Indians of North America 31 Placer deposits 31 Prospecting 30 Alaska Earthquake, Alaska, 1964 29 Hydroelectric power plants Law and legislation 29 Magnetic storms 28 Igneous rocks 27 Tin ores 27 Ammonoidea 26 Borings 26 Forest policy 26 Radioactive prospecting 26 Wilderness areas 26 Environmental monitoring 25 Fishery management 25 Foraminifera, Fossil 25 Engineering geology 24 Outdoor recreation 24 Environmental impact statements 23 Indians of North America Land tenure 23 Oil spills 23 Wrangell-Saint Elias National Park and Preserve (Alaska) 23 Geology, Economic 22 Katmai National Park and Preserve (Alaska) 22 Natural resources 22 Petroleum industry and trade Environmental aspects 22 Streamflow 22 Zinc ores 22 Chugach National Forest (Alaska) 21 Public lands Management 21 River sediments 21 World War, 1939-1945 Campaigns 21 Forest roads 20 Forests and forestry 20 Frozen ground 20 Klondike River Valley (Yukon) Gold discoveries 20 Micropaleontology 20 North Slope (Alaska) 20 Petroleum reserves 20 Wilderness areas Law and legislation 20 Coal mines and mining 19 Metamorphic rocks 19 Motor vehicles Recreational use 19 Nickel ores 19 Floods 18 Geology Research 18 Lead ores 18 Mineral industries 18 Eskimos 17 Gates of the Arctic National Park and Preserve (Alaska) 17 Glacier Bay National Park and Preserve (Alaska) 17