- Paul, George P. (George Phillip), 1879- author1
- Perry Davis & Son.1
- Pharmacie Legoll.1
- Phelps, H. J., Lt. Colonel, author1
- Polk & Calder Drug Co.1
- Powell, William M., 1862-1
- Powell, William M., 1862-, author1
- Powers and Weightman.1
- Ratheau, Jacques.1
- Reed & Carnrick.1
- Reese, John J. (John James), 1818-18921
- Rencontres internationales de recherches et de technologies medicales et pharmaceutiques 1989 : Montpellier, France)1
- Rhode, R. E. (Rudolph E.), 1860- author1
- Rice, Justus B., author1
- Richardson Drug Company (St. Louis, Mo.)1
- Richardson, R. E., author1
- Robbins, Daniel C., author1
- Rothschild Bros. & Co. (New York, N.Y.)1
- Rous, Charlotte.1
- Rust Bro's & Bird.1