| Series | Control Symbol | Title | Contents dates |
|---|---|---|---|
| R52 | O 7 B | British Phosphate Commissioners engineering files - Nauru, Ocean Island, Christmas Island - sundry buildings and equipment - equipment [1 folder of 6 pages] | 1969 - 1977 |
| R52 | OIA | Land Survey File 2 - General mining maps and traverses, mining land work face conmtour, analytical non-mining leased land. | May 1972 - Jan 1977 |