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- Caemmerer, H. Paul (Hans Paul), 1884-1962 2 results
- Calder, John 1 results
- Caldwell, Katherine 1 results
- California Commission of Immigration and Housing, 1913-1927 1 results
- Call to action conference Philadelphia, Pa.) 1 results
- Calvert, Anne 1 results
- Calvert, Robert 1 results
- Cambridge Housing Association 1 results
- Camden (N.J.) City Plan Commission 1 results
- Carey, Mathew, 1760-1839 1 results
- Carson, Cary 1 results
- Caryl, Charles W. 1 results
- Catlin, Robert A. 1 results
- Center City District (Philadelphia, Pa.) 3 results
- Center for Philadelphia Studies 1 results
- Central Conference of Moral Workers 1 results
- Central Philadelphia Development Corporation 5 results
- Chandler, T. P. (Theophilus Parsons), 1807-1886 1 results
- Cincotta, Gale 1 results
- Citizens' Council on City Planning (Philadelhia) 1 results
- Citizens' Council on City Planning (Philadelphia) 7 results
- Citizens' Council on City Planning (Philadelphia) Public Improvements Committee 2 results
- Clunies, Sandra MacLean 1 results
- Coane, Robert 2 results
- Cochran, Thomas 2 results
- Cohen, Amy 1 results
- Cole, Harriette 1 results
- Committee of Seventy (Philadelphia, Pa.) 1 results
- Committee on New Industrial Towns 1 results
- Conservation Company 1 results
- Convention Center Visitors Guide (Philadelphia, Pa.) 1 results
- Coolidge, Clara Amory 1 results
- Coolidge, T. Jefferson (Thomas Jefferson), 1863-1912 1 results
- Cope Linder Associates 1 results
- Crabtree, Charlotte A. (Charlotte Antoinette) 1 results
- Cranz, Galen 1 results
- Crawford, Andrew Wright, 1873- 1 results
- Crawford, Andrew Wright, 1873-1929 1 results
- Cross, Alfred William Stephens, 1860- 1 results
- Cuban National Planning Council (U.S.) 1 results
- Culbertson, Margaret 1 results
- Cultural Heritage Research Services 2 results
- Cumberland County Historical Society (Pa.) 1 results
- Custer, Jay F., 1955- 3 results
- Dan Slovic & Associates 1 results
- David, Charles W. 1 results
- De Boer, Saco Rienk, 1883- 1 results
- DelGiudice, Jim 1 results
- Delaware River Waterfront Corporation, 1 results
- Delaware Valley Council 2 results more…