1. Bard, G. E., 1952. Secondary succession on the piedmont of New Jersey. Ecol. Monogr. 22: 195?215.
2. Barnes, B. V. & Wagner, W. H., 1981. Michigan Trees. University of Michigan Press, Ann Arbor, Mi.
3. Bazzaz, F. A., 1075. Plant species diversity in old-field successional ecosystems in southern Illinois. Ecology 56: 45?488.
4. Boerner, R. E. J., 1984. Forest composition on the Lake Erie Islands. Amer. Midl. Nat. 111: 173?184.
5. Braun, E. L., 1961. The Woody Plants of Ohio. Ohio State University Press, Columbus, OH.