Journal RDF
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- Open Plasma Physics Journal
- Open Research Europe
- Operating Systems Review
- Operations Research
- Operations Research/computer Science Interfaces Series
- Ophthalmic Genetics
- Optica
- Optical and Quantum Electronics
- Optical Engineering
- Optical Materials
- Optical Materials Express
- Optics and Lasers in Engineering
- Optics and photonics news
- Optics and Spectroscopy
- Optics Communications
- Optics Continuum
- Optics Express
- Optics Letters
- Optik
- Optimal Control Applications and Methods
- Optimization and Engineering
- Optometry and Vision Science
- Opuscula philolichenum
- Oral History Review
- Oral Tradition
- Orbis (Kidlington): a journal of world affairs
- Orbis Litterarum: international review of literary studies
- Order: a journal on the theory of ordered sets
- Ore Geology Reviews
- Oregon historical quarterly. Oregon Historical Society