| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| The Geology of Liberia: A Selected Bibliography of Liberian Geology | 978-1-78039-186-1 (1-78039-186-2) | 2011 | R. Lee Hadden · U.S. Army Corps of Engineers |
| The Geology of Somalia: A Selected Bibliography of Somalian Geology, Geography and Earth Science. | 978-1-78039-185-4 (1-78039-185-4) | 2011 | R. Lee Hadden · U.S. Army Corps of Engineers |