Journal RDF
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- Problems of Communism
- Proc. Nat. Acad. Sci USA
- Proc. Natl. Acad Sci. USA
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- Proceedings of the National Academy of the Sciences of the United States of America
- Proceedings of the Royal Society of London - Series B: Biological Sciences
- Proceedings of the Royal Society of London B, Biological Sciences
- Proceedings of the Royal Society of London-Series B: Biological Sciences
- Proceedings of the Royal Society: Biological Sciences
- Proceedings of the Western Society for French History
- Proceedings of the...Society of American Foresters National Convention
- Procesos: Revista Ecuatoriana de Historia
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- Professional Geographer
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- Professional Psychology - Research & Practice
- Professional Psychology Research & Practice
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