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Principles of Field Biology and Ecology
Commissioners of Fairmount Park, 89th Annual Report, Philadelphia, 1956, p. 58.
Commissioners of Fairmount Park
89th Annual Report
Dice, Lee R., The Biotic Provinces of North Amer- ica, Ann Arbor, University of Michigan Press, 1943, p. 17.
The Biotic Provinces of North America
Donat, Harry S., The Frankford Story, Philadelphia, The Historical Society of Frankford, (No date), pp. 4-5.
The Frankford Story
Gates, Frank C., Field Manual of Plant Ecology, New York, McGraw-Hill Book Company, 1949, passim.
Field Manual of Plant Ecology
Geologic Atlas of New Jersey, Philadelphia Folio, Department of the Interior, 1909, passim.
Geologic Atlas of New Jersey
Harshberger, John W., Lectures on Plant Geography and Ecology, University of Pennsylvania Library (Unpublished), 1915, Lesson 29.
Lectures on Plant Geography and Ecology
Hall, Charles E., The Geology of Philadelphia County, Harrisburg, Board of Commissioners for the Second Geological Survey, 1881, passim.
The Geology of Philadelphia County
Historical Society of Frankford, Frankford—A His- torical Background, Philadelphia, 1952, p. 8.
Historical Society of Frankford
Frankford—A Historical Background
Illick, Joseph S., Pennsylvania Trees, Harrisburg, Department of Forestry, 1915, pp. 17-20.
Oosting, Henry J., The Study of Plant Communities, San Francisco, W. H. Freeman and Company, 1956, passim.
The Study of Plant Communities
Tansley, A. G., Practical Plant Ecology, New York, Dodd, Mead and Company, 1923, passim.
Practical Plant Ecology
United States Department of Agriculture, Climate and Man, 1941, pp. 1097-1098.
United States Department of Agriculture, Soils and Men, 1938, p. 1034.
White, Langdon C., and Renner, George T., Human Geography, New York, Appleton-Century-Crofts, Incorporated, 1938, pp. 163-191.
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