| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| Phosphate Deposits of the World: Phosphate Rock Resources v. 2 | 978-0-521-67333-4 (0-521-67333-X) | 2005 | R. P. Sheldon · D. F. Davidson |
| Phosphate Deposits of the World: Volume 2, Phosphate Rock Resources: Phosphate Rock Resources v. 2 | 978-0-521-30509-9 (0-521-30509-8) | 1989 | R. P. Sheldon · D. F. Davidson |