Ultramafic composition 98 Ultramafics 175 Ultrasonic tests 155 Ultrastructure 148 Ultraviolet radiation 721 Uncertainty 230 Unconformities 438 Unconsolidated materials 79 Underground facilities 122 Underground installations 200 Underground pipelines 445 Underground storage 173 Underwater acoustics 380 Underwater ice 92 Unexploded ordnance 106 Unfrozen water content 1,487 Uniaxial tests 153 United Kingdom--England 156 United Kingdom--Scotland 215 United States--Alaska 2,713 UNITED STATES--ALASKA 79 United States--Alaska--Alaska Range 107 United States--Alaska--Anchorage 171 United States--Alaska--Arctic National Wildlife Refuge 82 United States--Alaska--Barrow 480 United States--Alaska--Bering Glacier 81 United States--Alaska--Brooks Range 269 United States--Alaska--Chugach Mountains 85 United States--Alaska--Cook Inlet 171 United States--Alaska--Eagle River Flats 80 United States--Alaska--East-Central 125 United States--Alaska--East-Central Alaska 209 United States--Alaska--Fairbanks 381 United States--Alaska--Fort Richardson 141 United States--Alaska--Glacier Bay 88 United States--Alaska--Northern 337 United States--Alaska--Northern Alaska 395 United States--Alaska--North Slope 494 United States--Alaska--Prince William Sound 132 United States--Alaska--Prudhoe Bay 329 United States--Alaska--Seward Peninsula 116 United States--Alaska--Southeastern 92 United States--Alaska--Southeastern Alaska 114 United States--Alaska--Southern 228 United States--Alaska--Southern Alaska 220 United States--California 145 United States--California--Sierra Nevada 281 United States--Colorado 356 United States--Colorado--Front Range 178 United States--Idaho 117 United States--Maine 91 United States--Minnesota 161 United States--Montana 176 United States--New England 116 United States--New York 143 United States--Oregon 101 United States--Utah 137 United States--Washington 176 United States--Washington--Cascade Range 148 United States--Western U.S. 255 United States--Wisconsin 124 United States--Wyoming 159 Unsaturated zone 217 U/Pb 383 Uplifts 706 Upper air 114 Upper air--Temperature 137 Upper air--Wind 199 Upper Cenozoic 288 Upper Cretaceous 639 Upper Devensian 83 Upper Eocene 270 Upper Holocene 2,075 Upper Jurassic 160 Upper mantle 206 Upper Miocene 134 Upper Ordovician 138 Upper Paleozoic 161 Upper Permian 85 Upper Pleistocene 5,993 Upper Pliocene 172 Upper Precambrian 1,152 Upper Quaternary 1,889 Upper Weichselian 1,179 Upper Wisconsinan 260 Upwelling 389 Uranium 189 Uranium disequilibrium 94 Urban environment 206 Urban planning 566 USGS 944 USSR--Altai Mountains 84 USSR--Caucasus 200 USSR--Siberia 131 USSR--Tien Shan 103 USSR--Transbaikal 111 USSR--Ural Mountains 81 USSR--Yakutia 245 Utilities 401 Uttaranchal India 107