C-13/C-12 1,390 C-14 2,599 Calibration 587 Calving 553 Canada--Alberta 549 Canada--British Columbia 601 Canada--Northwest Territories 813 Canada--Quebec 553 Canada--Yukon Territory 725 Carbon 6,098 Carbon cycle 1,233 Carbon dioxide 3,387 Carbon isotopes 3,904 Carnivora 579 Cartography 639 Case studies 971 Cements 622 Cenozoic 18,797 Channels 597 Channels (waterways) 1,177 Chemical analysis 1,365 Chemical composition 4,015 Chemical ice prevention 1,025 Chemical properties 1,137 China--Qinghai-Xizang Plateau 524 Chlorophyll 787 Chlorophylls 880 Chordata 4,034 Circulation 1,395 Classification 794 Classifications 3,202 Clastic rocks 978 Clastic sediments 5,518 Clay 586 Clays 1,149 Clay soils 1,027 Climate 6,578 Climate change 12,277 Climate--Cycles and trends 1,183 Climate effects 2,686 Climate forcing 851 Climatic change 11,945 Climatic changes 3,752 Climatic factors 2,262 Climatology 2,895 Cloud cover 776 Cloud droplets 621 Cloud physics 2,349 Clouds 2,488 Cloud seeding 529 Clouds (meteorology) 2,148 Coastal environment 1,208 Coastal topographic features 1,168 Cold tolerance 717 Cold weather construction 3,549 COLD WEATHER CONSTRUCTION 666 Cold weather operation 1,615 Cold weather performance 1,710 Cold weather survival 840 Cold weather tests 758 Communities 753 Compressive properties 1,188 Computer applications 4,086 Computerized simulation 1,820 Computer programs 1,239 Concentration 2,337 Concrete admixtures 769 Concrete aggregates 531 Concrete durability 865 Concrete freezing 964 Concretes 754 Concrete strength 1,123 Concrete structures 1,119 Coniferales 495 Conservation 2,386 Construction 2,495 Construction equipment 832 Construction materials 2,029 Continental drift 1,284 Continental margin 771 Continental shelf 1,830 Convection 1,043 Cooling 929 Cores 3,455 Correlation 2,844 Corrosion 502 Cost analysis 1,360 Countermeasures 2,910 Cracking (fracturing) 668 Creep 561 Cretaceous 749 Crust 803 Crustacea 1,127 Crustal studies 791 Cryobiology 815 Cryogenic soils 2,517 Current research 973 Currents 2,455 Cycles 799 Cyclones and anticyclones 513