Discovery Creek Children's Museum of Washington: Where history, nature, and the arts come to life for children and adults to explore. Innovative programming, seasonal nature camps, and outdoor nature experiences including rock-climbing, canoeing, fishing, and hiking. Located in Washington, DC and Glen Echo Park, MD.
Friends of Sligo Creek: Organization committed to improve the water quality, natural habitat, and ecological well-being of the Sligo Creek watershed. Overview of committees and accomplishments, articles, and newsletters.
Montgomery County Sierra Club: Bylaws, summary of local development plans, events, current issues and newsletter.