Ultramafics 82 Ultrasonic tests 162 Ultrastructure 147 Ultraviolet radiation 726 Uncertainty 238 Unconformities 254 Underground facilities 128 Underground installations 119 Underground pipelines 451 Underground storage 182 Underwater acoustics 393 Underwater ice 97 Unexploded ordnance 106 Unfrozen water content 1,652 Uniaxial tests 114 United Kingdom--England 145 United Kingdom--Scotland 236 United Kingdom--Wales 76 United States--Alaska 2,212 UNITED STATES--ALASKA 105 United States--Alaska--Alaska Range 81 United States--Alaska--Anchorage 170 United States--Alaska--Arctic National Wildlife Refuge 77 United States--Alaska--Barrow 444 United States--Alaska--Bering Glacier 77 United States--Alaska--Brooks Range 229 United States--Alaska--Cook Inlet 156 United States--Alaska--Eagle River Flats 78 United States--Alaska--East-Central Alaska 209 United States--Alaska--Fairbanks 309 United States--Alaska--Fort Richardson 139 United States--Alaska--Fort Wainwright 70 United States--Alaska--Glacier Bay 77 United States--Alaska--Northern Alaska 395 United States--Alaska--North Slope 433 United States--Alaska--Prince William Sound 120 United States--Alaska--Prudhoe Bay 262 United States--Alaska--Seward Peninsula 101 United States--Alaska--Southeastern Alaska 114 United States--Alaska--Southern Alaska 220 United States--California 127 United States--California--Sierra Nevada 261 United States--Colorado 331 United States--Colorado--Front Range 135 United States--Idaho 103 United States--Maine 93 United States--Minnesota 151 United States--Montana 134 United States--New England 97 United States--New York 124 United States--Oregon 93 United States--Rocky Mountains 83 United States--Utah 118 United States--Washington 160 United States--Washington--Cascade Range 96 United States--Western U.S. 207 United States--Wisconsin 103 United States--Wyoming 127 Unloading 73 Unsaturated zone 168 U/Pb 279 Uplifts 435 Upper air 115 Upper air--Temperature 141 Upper air--Wind 201 Upper Cenozoic 158 Upper Cretaceous 315 Upper Eocene 155 Upper Holocene 1,774 Upper Jurassic 70 Upper mantle 120 Upper Miocene 88 Upper Ordovician 119 Upper Paleozoic 89 Upper Pleistocene 4,532 Upper Pliocene 114 Upper Precambrian 840 Upper Quaternary 1,422 Upper Weichselian 902 Upper Wisconsinan 167 Upwelling 370 Uranium 114 Uranium disequilibrium 75 Urban environment 196 Urban planning 566 URBAN PLANNING 79 USGS 602 USSR--Altai Mountains 85 USSR--Angara River 70 USSR--Caucasus 203 USSR--Karelia 73 USSR--Kola Peninsula 73 USSR--Siberia 136 USSR--Tien Shan 105 USSR--Transbaikal 116 USSR--Ural Mountains 81 USSR--Yakutia 253 USSR--Yenisey River 71 Utilities 417 Uttaranchal India 96