- 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.
http://www.perkiomenwatershed.org/
- Stroud Water Research Center
Seeks to advance the knowledge of freshwater ecosystems through interdisciplinary research into all aspects of streams, rivers, and their watersheds.
http://www.stroudcenter.org/
- Upper Perkiomen Watershed Coalition
Promotes public education and land use planning to protect the natural beauty of the Upper Perkiomen Watershed in Montgomery County Pennsylvania.
http://www.upwcwatershed.org/
- 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.
http://www.watershedatlas.org/index.html
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