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- P.S. Duval & Son. (1)
- Pacific Map Depot. (1)
- Paine, William H. (7)
- Palfrey, J. C. (1)
- Palfrey, John Carver, 1833-1906. (2)
- Paterson, J. T. (1)
- Patton, J. H. (1)
- Patton, J. Houston. (6)
- Payne, William Henry Fitzhugh, 1830-1904. (1)
- Pearson, F. M. (1)
- Pegram, John, 1832-1865. (1)
- Pendleton, S. T. (1)
- Penfield, Henry L. (1)
- Pennsylvania Railroad. (1)
- Perham, Aurestus S., b. 1844. (1)
- Perrine, C. O. (Charles O.) (3)
- Perris, William. (1)
- Perry, George T. (1)
- Peseux, M. (4)
- Peter Adams Company. (1)
- Peter S. Duval and Son. (1)
- Phelps & Watson. (4)
- Phelps, T. S. (1)
- Philadelphia Board of Trade. Committee on Inland Transportation. (2)
- Philadelphia Inquirer (Firm) (1)
- Philadelphia Inquirer and Daily News (Firm) (1)
- Philadelphia Publishing Company. (1)
- Pitzman, Julius, b. 1837. (4)
- Plum, William R. (2)
- Poe, O. M. (Orlando Metcalfe), 1832-1895. (27)
- Poole Brothers. (4)
- Pope, John, 1822-1892. (5)
- Porter, David D. (David Dixon), 1813-1891. (1)
- Potomac, Fredericksburg, and Piedmont Railroad. (1)
- Powell, W. Angelo. (4)
- Preston, Noble D. (8)
- Prime, Fred. E. (1)
- Purse, Reginald. (1)