AMS]]>'> IGBP]]>'> ISO]]>'> http://www.ontarioarchaeology.on.ca]]>'> http://www.ipsl.jussieu.fr/OCMIP/]]>'> http://members.aol.com/dsfrink/ocr/ocrpage.htm]]>'> http://www-odp.tamu.edu/]]>'> http://www.ornl.gov]]>'> http://www-eosdis.ornl.gov/]]>'> ]> oxygen, a non-metal element ocean anoxia event optimum activity range Organization of American States Ontario Archaeological Society (Canada). See &LINK001; organochlorine Ocean Biogeochemistry and Ecosystem Analysis (project under &IGBP; II) Ocean Ecosystems Analysis Ocean Circulation and Climate Advanced Modelling (UK) Ocean Circulation Model Ocean Carbon-Cycle Model Intercomparison Project, component of &IGBP;. See &LINK002; Organization of Czech Palynologists Organization of Czechoslovak Palynologists organochlorine pesticides optical character recognition. Oxidizable carbon ratio, an experimental dating technique. See &LINK003; Oldest Dryas (climate/time unit) outside diameter (e.g., of a core barrel) Ocean Drilling Program. See &LINK004; Organization for Economic Cooperation and Development Oxford English Dictionary overland flow Orange Free State, in South Africa Ohio (US state) ocean-island basalts oxygen isotope stage(s) Oklahoma (US state) out-going long-wave radiation &ISO; country code for Oman organic matter Ontario (Canadian Province) Ontario (Canadian Province) out of country out of the office, e.g., in the field out of province Organization of Petroleum Exporting Countries oil production per day Oregon (US state) airport code for O'Hare International Airport, Chicago, USA Oak Ridge National Laboratory (US). See &LINK005; Oak Ridge National Laboratory Distributed Active Archive Center for Biogeochemical Dynamics. See &LINK006; osmium, a transition metallic element Ordovician-Silurian boundary Ordnance Survey (UK) open science conference(s), held by &IGBP; optically-stimulated luminescence, an experimental dating technique Oil Sands Tailings Research Facility Old World (Europe, Asia, Africa) organic-walled phytoplankton prefix for &AMS; radiocarbon dates produced at Oxford University, England (UK)