The Dr. Shaw Memorial Library and Vienna Historical Society are co-sponsoring an author talk with local historian Dale Potter-Clark on Wednesday, November 16 at 6PM at the library, 344 Pond Rd., Mt. Vernon.  Potter-Clark will discuss her new historical novel about the Underground Railroad, Escape from Bunker Hill, the story of a Maine couple who move to Florida to help slaves escape north.  The book also follows 4 escapees as they head North and make their way through Maine.