| Author | Titles | | 1.
| Orr, Boyd | 1 | | 2.
| Orr, Chris, 1943- | 2 | | 3.
| Orr, Christopher, 1943- | 0 | | 4.
| Author is: Orr, Chris, 1943- | 2 | | 5.
| Orr, Christopher John, 1943- | 0 | | 6.
| Author is: Orr, Chris, 1943- | 2 | | 7.
| Orr, Emily | 1 | | 8.
| Orr, John | 1 | | 9.
| Orr, John Boyd, 1880-1971 | 1 | | 10.
| Orr, Lynn Federle | 3 | | 11.
| Orr, Roger | 7 | | 12.
| Orrantia, Juan, 19--?- | 2 |
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