1. Bowman, Forest Physiography: 42 (1911).
2. Rossmassler, Der Walde: 31 (1881).
3. U. S. Geological Survey Water- Supply and Irrigation Paper 1907 190
4. U. S. Dept. Agric. Bureau of Forestry Bulletin 1904 47
5. U. S. Geological Survey Water- Supply and Irrigation Paper 1906 159 Water Resources of Mississippi