The National Duncan Glass Society is a non-profit organization founded in 1975 dedicated to preserving and sharing the rich history of Duncan & Miller Glass and conserving the permanent collection of the Duncan & Miller Glass Museum. As a member, you receive free admission to the Duncan & Miller Glass Museum plus two (2) guest passes, special discounts on glass purchases at the Museum Store, and quarterly issues of The National Duncan Glass Journal. With your Three-Face Corporate Membership, you receive all the benefits of the previous levels plus a 1/8 page corporate ad in the quarterly journals for one year.