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- Center City District (Philadelphia, Pa.) 1 results
- Central Philadelphia Development Corporation 2 results
- Chester County Historical Society (West Chester, Pa.) 1 results
- Chisenhall, Fred 1 results
- Citizens' Association for the Improvement of the Streets and Roads of Philadelphia 2 results
- Clark, David T. 1 results
- Cohen, Charles Joseph, 1847- 1 results
- Connelly, Chuck, 1955- 3 results
- Convention of Delegates from the Thirteen Original States Philadelphia) 1 results
- Cope Linder Associates 1 results
- Craver, W. B. 1 results
- Crompton, Robert Donald 2 results
- Crosscup & West 3 results
- Crowell, Charles 1 results
- Cunningham, George Hamilton 1 results
- Cushing, Charles 1 results
- D.G. Wilson, J. Childs Co 1 results
- DFN Gallery 3 results
- Dan Slovic & Associates 1 results
- De Graw, P. V., 1853-1914 1 results
- Delaware County Historical Society 1 results
- Delaware. Bureau of Archaeology and Historic Preservation 1 results
- Delaware. Division of Highways. Location and Environmental Studies Office 1 results
- Delta Group (Firm) 1 results
- Develin, R. 1 results
- Devereux 1 results
- Diffenderffer, Frank Ried, 1833-1921 2 results
- E.A. Wright; 1 results
- Elfreth's Alley Association, Inc 1 results
- Experience 1 results
- Faust, F.n 1 results
- Fenner, Sears & Co 1 results
- Fischer, Joseph 1 results
- Francis Bros 1 results
- Franklin Survey Company, 1 results
- Fraternal Order of Eagles 1 results
- Frederic R. Kirkland Collection 1 results
- Free Library 1 results
- Garrow, Patrick H. 1 results
- Geddes Brecher Qualls Cunningham: Architects 1 results
- Geographia Map Company 2 results
- Geographical Directories Co 1 results
- Gerard, James W. (James Watson), 1823-1900 1 results
- Gilbert & Gihon 1 results
- Gillon, Edmund Vincent 1 results
- Green, Doron, 1868- 2 results
- Grenald Associates 1 results
- Griffin, Martin I. J. 1 results
- Gross, Alexander 1 results
- Gross, Alexander, 1879-1958 2 results more…