- McGrath, Joyce2
- Moore, George W.2
- Ordway, William H., M.D.2
- Orme, David (1727-1812)2
- Oscar Harrison Rogers, MD2
- P. H. Schmidt2
- Pach Bros. (New York, NY)2
- Parke, Davis, and Company2
- Phelps (New Haven, Conn.),2
- Radin, Herman Theodore2
- Rekers2
- Reynolds, Howard2
- Richard Liebreich2
- Richards, Ethel Bradley (New Haven, CT)2
- Roberts, George C. M.2
- Sawyer, Edward Warren (b. 1848)2
- Shpitalnik, Vladimiar2
- Simonds Commercial Photo Co.2
- Simpson of London2
- Simpson, James Young, Sir (1811-1870)2