Earth 422 Earth crust 640 Earth dams 459 Earth fills 225 Earth Observing System 217 Earthquakes 1,134 Earthwork 1,121 East-Central Alaska 540 Echinodermata 193 Echo sounding 506 Ecology 11,818 Ecology--Faunal 820 Ecology--Floral 539 Economic analysis 287 Economic development 1,701 Economic geology 411 Economics 664 Ecosystems 5,479 Eddies 359 Education 550 Eemian 276 Effects 1,260 Elastic constants 205 Elastic properties 343 Elastic waves 737 Electrical conductivity 415 Electrical measurement 837 Electrical methods 674 Electrical properties 411 Electrical resistivity 916 Electric equipment 206 Electric fields 268 Electric heating 427 Electric power 1,193 Electromagnetic methods 534 Electromagnetic properties 247 Electromagnetic prospecting 292 Electromagnetic radiation 527 Electronic apparatus 275 Electron probe data 250 Elevation 887 El Nino 223 El Nino Southern Oscillation 515 Embankments 1,237 Endopterygota 271 Energy 253 Energy balance 981 Energy sources 223 Engineering 818 Engineering geology 2,549 Engineering properties 2,081 Engines 200 Enrichment 202 Environment 563 Environmental analysis 1,781 Environmental effects 1,449 Environmental geology 411 Environmental impact 2,305 Environmental impact assessment 201 Environmental management 1,109 Environmental protection 2,467 Environmental tests 721 Environments 637 Environment simulation 688 Eocene 733 Eolian features 360 Equations 742 Equipment 1,608 Erosion 3,789 Erosion features 924 Erosion rates 273 Erratics 367 Errors 440 ERS 426 Eruptions 705 Eskers 489 Estuaries 434 Europa Satellite 200 Europe--Fennoscandia 223 Eustacy 197 Eutheria 1,244 Evaluation 224 Evaporation 865 Evaporites 222 Evapotranspiration 446 Evolution 655 Excavation 1,348 EXCAVATION 362 Expeditions 2,591 Expeditions: 1955-92 Soviet Antarctic Expedition 425 Expeditions: 1957-58 International Geophysical Year 288 Experimental studies 5,434 Experimentation 5,866 Exploitation 204 Exploration 1,294 Exploration, history 311 Explosives 654 Exposure age 309 Extraterrestrial ice 715 Extraterrestrial material 284