Maps
| Title | Diagram of points of base prolongation |
| Date | 1886 |
| Scale | [no scale] |
| Dimensions | 28 x 14 cm |
| Place of Publication | [Cape Town] |
| Publisher | Surveyor General's Office |
| Date Published | 1887 |
| Series | G |
| series No | 21 |
| Year | 1887 |
| Source | Annexures to the Votes and proceedings of the House of Assembly/Legislative Council |
| Source Volume | II |
| Source Date | 1887 |