D. J. · D. Johanson · Dale A Johanson
| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Measuring Distances in Africa: Applying the Spherical Law of Cosines for Sides | 978-0-9978303-1-6 (0-9978303-1-X) | 2018 |
| Measuring Distances in Europe: Applying the Spherical Law of Cosines for Sides | 978-0-9978303-2-3 (0-9978303-2-8) | 2018 |
| State Capitals and the Distance Between Them: Applying the Spherical Law of Cosines for Sides | 978-0-9978303-3-0 (0-9978303-3-6) | 2019 |