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- Pacific Northwest National Laboratory, Environmental Technology Division, Ecology Group
- Pacific Northwest National Laboratory, Fundamental Science Division, Advanced International Studies Unit (AISU)
- Penguin Science
- Plymouth State University, Center for the Environment
- Portland State University, Center for Lakes and Reservoirs
- Princeton University, Department of Ecology and Evolutionary Biology, Equid Research and Conservation Project
- Puerto Rico Mayagüez, Universidad de - Caribbean Climate Studies Group
- Purdue University, Department of Forestry and Natural Resources, Hardwood Tree Improvement and Regeneration Center
- Purdue University, Department of Forestry and Natural Resources, Human-Environment Modeling and Analysis Laboratory
We welcome suggestions for additional preprint sites. If you are aware of a site we have not included, please Add E-prints.