Author
Philadelphia City Planning Commission
21
Pennsylvania Department of Internal Affairs. Bureau of Statistics
19
Pennsylvania Bureau of Statistics and Information
13
Pennsylvania State University Bureau of Business Research
13
Pennsylvania Department of Commerce. Bureau of Statistics, Research, and Planning
12
Pennsylvania Department of Internal Affairs
10
Pennsylvania Department of Labor and Industry
9
Schoff, Wilfred H (Wilfred Harvey), 1874-1932
9
International Congress of Navigation Philadelphia
8
Leffler, George Leland, 1899-1958
8
Taylor, John, 1754-1838
8
Freedley, Edwin T (Edwin Troxell), 1827-1904
7
Pennsylvania Bureau of Industrial Development. Industry Section
7
Pennsylvania State College Bureau of Business Research
7
Eaton, Moses F
6
Edwards, Jonathan
6
Gregg, Isaac
6
Gregg, O. Ormsby
6
Nicholson, John, 1757-1800
6
Pennsylvania Bureau of Industrial Development. Division of Statistics
6
Pennsylvania Department of Commerce
6
Pennsylvania Department of Commerce. Bureau of Statistics
6
Pennsylvania Department of Internal Affairs. Bureau of Statistics and Information
6
Wallace, Anthony F. C., 1923-
6
Williamson, Benjamin
6
Edwards, Richard
5
Greater Pittsburgh Chamber of Commerce
5
Pennsylvania Bureau of Employment Security
5
University of Pennsylvania Institute for Urban Studies
5
University of Pittsburgh Bureau of Business Research
5
Arthur D. Little, Inc
4
Butler, Elizabeth Beardsley
4
Carnegie, Andrew, 1835-1919
4
Carpenter's Society of Carlisle
4
Carpenters' Company of the City and County of Philadelphia
4
Centennial Exhibition
4
Henfrey, Benjamin
4
Humphreys, David, 1752-1818
4
Pennsylvania Historical and Museum Commission
4
Philadelphia (Pa.) Redevelopment Authority
4
R.G. Dun & Company
4
Reno Oil and Land Company
4
Taylor, Frank H (Frank Hamilton), 1846-1927
4
Tolles, Frederick Barnes, 1915-
4
United States National Park Service
4
Whidden, Guy C (Guy Carleton), 1868-
4
Allegheny Conference on Community Development (Pa.)
3
Chamber of Commerce of Pittsburgh
3
Chester (Pa.) City Planning Commission
3
Couvares, Francis G., 1948-
3
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