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• Bombay Hook National Wildlife Refuge
  
  
• Christina River Watershed Cleanup (April cleanup event)
  
  
• Delaware Museum of Natural History
  
  
• Delaware Nature Society
  
  
• Delaware State Parks and School Group Programs
  
  
• Delaware Tourism Office
  
  
• DuPont Environmental Education Center
  
  
• EcoDelaware.Com (Gateway to the Natural Wonders of the State of Delaware)
  
• Kalmar Nyckel - Delaware's Tall Ship
  
  
• University of Delaware's Coast Day (October event) and its Hugh R. Sharp Campus

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• Adventure Aquarium

• Battleship New Jersey - A Floating Museum on the Delaware

• Bayshore Center at Bivalve (Bayshore Discovery Project) - A.J. Meerwald Tall Ship Educational Sails

• Bulls Island Recreation Area
  
  
• Cape May Bird Observatory
  
  
• Delaware River Steam Boat Floating Classroom

• Gloucester City Sail: The North Wind Schooner

• Howell Living History Farm

• Lawrence Nature Center
  
  
• New Jersey Audubon Society

• New Jersey Division of Travel and Tourism

• New Jersey Pinelands
  
  
• New Jersey State Parks: Listing of Parks and Listing of Interpretive Centers
  
  
• Old Barracks Museum
  
  
• Palmyra Cove Nature Center
  
  
• Rancocas Nature Center
  
  
• Scotland Run Park
  
  
• Skylands of New Jersey
  
  
• South Jersey Scrub (Spring cleanup event)
  
  
• Tulpehaking Nature Center at the Abbott Marshlands
  
  
• Washington Crossing State Park (New Jersey)
  
  
• Woodford Cedar Run Wildlife Refuge

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• Catskill Mountains Region
  
  
• Delaware River Scenic Byway
  
  
• New York State Nature Centers and Education Programs
  
  
• New York State Tourism Site
  
  
• Sullivan County Trailkeeper Project

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• Academy of Natural Sciences
  
  
• Bartram's Garden
  
  
• Bowman's Hill Wildflower Preserve
  
  
• Brandywine River Museum
  
  
• Bucks County Audubon Society
  
  
• Churchville Nature Center
  
  
• Cobbs Creek Community Environmental Education Center
  
  
• Delaware and Lehigh National Heritage Corridor 
  
  
• Delaware Canal State Park
  
  
• Discovery Pathways
  
  
• Fairmount Water Works
  
  
• Great American Cleanup of Pennsylvania (March-May cleanup event)
  
  
• Glen Foerd

• Independence Seaport Museum

• John Heinz National Wildlife Refuge at Tinicum

• Lower Merion Conservancy

• Muhlenberg College's Graver Arboretum

• Myrick Conservation Center
  
  
• National Canal Museum and Hugh Moore Historical Park
  
  
• NPS Delaware Water Gap (DEWA) & Monroe County (Pa.) Transit Authority's Pocono Pony Rides - Free Weekend Shuttle Service
  
  
• Nurture Nature Center
  
  
• Peace Valley Nature Center

• Pennsylvania Association of Environmental Educators

• Pennsylvania Dept. of Conservation and Natural Resources: Find a Park

• Pennsylvania State Parks - Environmental Education and Interpretation

• Perkiomen Watershed Conservancy

• Pennsylvania Tourism Office

• Pennypack Ecological Restoration Trust
  
  
• Philadelphia Science Festival (April event)
  
  
• Pocono Environmental Education Center
  
  
• Pocono Mountains Region
  
  
• Riverbend Environmental Education Center
  
  
• Schuylkill Center for Environmental Education
  
  
• Schuylkill River Greenways
  
  
• Schuylkill Scrub (Spring cleanup event)
  
  
• Silver Lake Nature Center

• South Mountain YMCA Camps

• Stroud Water Research Center

• Temple University Ambler Campus' EarthFest (April event) 

• Washington Crossing Historic Park (Pennsylvania)
  
  
• Wildlands Conservancy's Preserves

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• Alliance for Watershed Education of the Delaware River
  
  
• Appalachian Mountain Club - Delaware Valley Chapter
  
  
• Appalachian Trail Conservancy
  
  
• Circuit Trails
  
  
• Delaware River Heritage Trail
  
  
• Delaware River Sojourn (June paddling/camping event)
  
  
• Delaware Water Gap National Recreation Area
  
  
• East Coast Greenway
  
  
• Highlands Trail (A Project of the New York-New Jersey Trail Conference)
  
  
• Our Shared Waters Partner Listing
  
  
• Partnership for the Delaware Estuary (PDE): Delaware River Festival (Fall event)
  
  
• PDE:  Events and Volunteer Opportunities
  
  
• Riverways
  
  
• Scenic, Wild Delaware River: National Geographic Geotourism MapGuide
  
  
• Upper Delaware Scenic & Recreational River