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-RKFERENCE8- 
1. ADAMS, C. C., An ecological survey in northern Michigan. 
A report from the University Museum, University 
of Michigan, published, by the State Board of Geo¬ 
logical Survey as a part of the report for 1905. 
Lansing, Mich. 1906. Part I, pp. 17 - 47, written 
by Dr. A. 0. Ruthven, deals with the general 
ecological relations of the Porcupine Mountains, 
and pp. 75 - 92 contain notes on the flora of 
these mountains. 1905. 
2. BEAL, W. J., Observations on successions of forests in 
northern Michigan. Rep. Mich. Forestry Comm. 
1:25 - 29. 1888. 
3. BURT, W. A., Catalogue of the plants collected in the 
primitive region south of Lake Superior in 1846. 
D. Cooley, Jackson’s Lake Superior, pp. 875 - 
882. Washington, D. C. 
4. CLEMENTS, F. E. , Plant Succession, An Analysis of the 
Development of Vegetation. Publ. 242, Carnegie 
Inst. Wash. 1916. 
5. COOPER, W. S., The climax forest of Isle Royale, Lake 
Superior, and its development. BOT. GAZ. 55:1 - 
44, 115 - 140, 189 - 235. 1913. 
6. COWLES, E. C., The physiographic ecology of Chicago 
and vicinity. BOT. GaZ. 31:73 - 108, 145 - 182, 
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