| "On the geodesic lines on an oblate spheroid" | Edited |
|---|---|
| Edited | of Geodetic Science and Surveying, Ohio State Univ |
| The Mercator Projections | |
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| "Chapter 3" | , britannica, Retrieved 2020-11-07 |
| : 329—340 | , nationalgeographic, Retrieved 2020-11-07 |
|---|---|
| Edited | , nationalgeographic, Retrieved 2020-11-07 |
Edited.