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Personal Index published in the Guide to the Coalfields
| Name | Year | Page | Section |
| Oniell, V. | 1965 | 190 | N.C.B. South-Western Division |
| 1972 | 105 | N.C.B. East Wales Area | |
| Onions, O. J. | 1948 | 202 | N.C.B. North-Western Division |
| 1948 | 204 | N.C.B. North-Western Division | |
| 1948 | 206 | N.C.B. North-Western Division | |
| Onions, P. K. | 1958 | 270 | |
| 1965 | 119 | N.C.B. North-Western Division |
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