| Author | Titles | | 1.
| O'Brien, Gregory | 1 | | 2.
| O'Brien, James | 1 | | 3.
| O'Brien John, 1944- | 0 | | 4.
| Author is: O'Brian, John, 1944- | 3 | | 5.
| O'Brien, Michael James | 2 | | 6.
| O'Brien, Patrick | 1 | | 7.
| O'Brien, Sophie | 1 | | 8.
| O'Brien, Tamiko | 1 | | 9.
| O'Brien, Vincent | 1 | | 10.
| Obrist, 1968- | 0 | | 11.
| Author is: Obrist, Hans-Ulrich, 1968- | 66 | | 12.
| Obrist, Barbara | 1 |
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