Journal RDF
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- Open Plasma Physics Journal
- Open Praxis
- Open Research Europe
- Operating Systems Review (ACM)
- Operations Research
- 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 (English translation of Optika i Spektroskopiya)
- 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
- Orbis Litterarum
- Order
- Ore Geology Reviews
- Oregon Historical Quarterly