Reddit reviews Tangier Island: Place, People, and Talk

This is the book you want.

One notable thing aside from just vocabulary differences is that Tangier English takes part in the was/weren't pattern. In standard American English one says "You were home" or "You weren't home." In the majority of southern AmE dialects that use was, one says "You was home" or "You wasn't home." Tangier and Smith Islands distinguish affirmative and negative cases: "You was home" or "You weren't home" but never *"You were home" or *"You wasn't home."