Names
- Parker, Edward Foster.1
- Patterson, Robert Porter, 1891-1952.1
- Patton, Carl S. (Carl Safford), 1866-1939.1
- Patton, Carl S. (Carl Safford), 1891-1952.1
- Peerless Portland Cement Company.1
- Pennsylvania Railroad.1
- Pere Marquette Line Steamers.1
- Pere Marquette Railway.1
- Perkins, John A. (John Alanson), 1914-1
- Perkins, John A. (John Alanson), 1914-1982.1
- Peterson, Reuben, 1862-1942.1
- Phelps, William Lyon, 1865-1943.1
- Phelps, William Lyon, 1868-1943.1
- Pillsbury, W. B. (Walter Bowers), 1872-1960.1
- Pollock, James K. (James Kerr), 1898-1968.1
- Pollock, James Kerr, 1898-1
- Pontiac, Oxford and Northern Railroad Company.1
- Port Huron and North Western Railway Company.1
- Potter, Louise, 1895-1
- Power, Eugene B., 1905-1