Excerpt from Pennsylvania
For the general plan of this Supplement, and for kindly and helpful criticisms, I am greatly indebted to the authors of the Series.
Acknowledgment is also due for the following photographs: Figs. 1, 2, and 44, presented by Professor Milton C. Cooper of Philadelphia; Figs. 5 and 42, presented by Professor Ralph S. Tarr of Cornell University; Figs. 6 and 35, presented by Dr. J. T. Rothrock, Commissioner of Forestry; Figs. 7, 8, 9, 10, 11, 12, and 13, presented by Professor Daniel S. Hartline of the Bloomsburg State Normal School; Figs. 17 and 18, presented by the Westinghouse Air Brake Company; Figs. 21, 23, and 24, presented by Superintendent D. A. Harman of Hazleton, Pennsylvania; Figs. 26, 27, and 28, presented by the American Bridge Company; Fig. 46, presented by my wife; Fig. 48, presented by Miss Effie Starrett, teacher in Pottstown schools; Fig. 50, presented by Dr. J. P. McCaskey of Lancaster; Fig. 53, presented by Dr. Daniel Carhart of Western University of Pennsylvania.
Hearty thanks are tendered to city and borough superintendents all over the state for valuable information respecting local matters.
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