This habitat also contains gray and black birch trees. The ship was made from oak, black birch, and red pine. Black birch is the most common source of extract. Cherry, red maple, black birch, and sugar maple became common species in the understory. The executive office doors are made of black birch, with hand carvings depicting Alaskan industry. Black birch seeds at a prolific rate and quickly colonize disturbed areas. These trees include black birch, tulip tree, white ash, basswood, hickory, beech, and sugar maple. "Black Birch" (1977), "Autumn Bells" (1978).