| Artist | Titles | 1.
| O'Donovan, William Rudolf, 1844-1920, painter. | 4 | 2.
| O'Donovan, William Rudolf, 1844-1920, sculptor. | 35 | 3.
| O'Donovan, William Rudolph, 1844-1920, painter. | 0 | 4.
| See: O'Donovan, William Rudolf, 1844-1920, painter. | 4 | 5.
| O'Donovan, William Rudolph, 1844-1920, sculptor. | 0 | 6.
| See: O'Donovan, William Rudolf, 1844-1920, sculptor. | 35 | 7.
| Odorfer, Adolf, 1902- , sculptor. | 2 | 8.
| Odorizzi, Mario, contractor. | 1 | 9.
| O'Dowd, Robert, 1936- , sculptor. | 0 | 10.
| See: Dowd, Robert, 1936- , sculptor. | 1 | 11.
| O'Dowdy, Danny, 1938- , sculptor. | 8 | 12.
| Odza, Ted, 1915- , sculptor. | 0 | 13.
| See: Odza, Theodore, 1915- , sculptor. | 5 | 14.
| Odza, Theodore, 1915- , sculptor. | 5 |
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