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1920. SUMMER PLANTING OF WHITE PINE ON THE MICHIGAN STATE FORESTS 
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(75) Williamson, A. W. 
1913. COTTONWOOD IN THE MISSISSIPPI VALLEY. TJ. S. Dept. Agr. Bui. 24, 
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(76) Wisconsin State Conservation Commission. 
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(77) Woolsey, T. S., and Chapman, H. H. 
1914. norway pine in the lake states. U. S. Dept. Agr. Bui. 139, 42 p., 
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(78) Young, L. J. 
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(79)Ziegler, E. A. 
1915. FURTHER NOTES ON THE EFFECT OF EXPOSURE ON WHITE PINE 
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