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- Oxygen Generation System
- Ontario Geological Survey
- Off-gas system
- Oklahoma Geological Survey
- Ontario Graduate Scholarships
- Opitz g syndrome
- IATA code for Ogdensburg International Airport, Ogdensburg, New York, United States
- Objective grading system
- Office of Graduate Studies
- Oligogalacturonides
- Operator to General Support
- Optical Grating Spectrometer
- Osteogenic sarcoma - also OS
- Overseas Ground Station
tác giả
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