Human edited web directory based on the DMOZ data. To find out more about this project please use the top main menu.
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- Watershed Atlas of the Allegheny River Rich source of information about the environmental resources of the Allegheny River watershed and how human activities affect water quality and the environment.
- Stroud Water Research Center Seeks to advance the knowledge of freshwater ecosystems through interdisciplinary research into all aspects of streams, rivers, and their watersheds.
- Perkiomen Watershed Conservancy Founded to protect and conserve the natural resources of the 362 mile Perkiomen Watershed. Promotes an environmental ethic through education, land conservation and watchdog activities.