Lighthouses and Friends National Park Service - lighthouses, etc. Friends of Doubling Point Light - 0ur sister association. Spring Point Ledge Light - South Portland, fine site. Town of Arrowsic, Maine - our home port. Lighthouse Digest - from Lighthouse Depot. The Island Institute - founder of Maine Lights program. Tony Kulik - Limited Edition Wood Engravings The Maine Maritime Museum - preserving Maine's maritime heritage. Maine Harbors - great site for mariners. New England Lighthouses: a Virtual Guide - beautiful and comprehensive. Maine.info - general info about Maine.