The Haskell Free Library and Opera House is the public library of Derby Line, Vermont and Stanstead, Quebec. It sits right on the US-Canadian border. In fact, a black line across the floor marks the division. You enter the lovely turn-of-the-century building in Vermont, but you check out the books in Quebec. And, the librarian who assists you may be either a citizen of the United States or Canada, or both and, probably bilingual. The building and its facilities are governed by a seven-member board of trustees — four Americans and three Canadians — who serve without pay.