R. P. · Robert E. Piepenburg · Robert P.
| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| The Spirit of Ceramic Design: Cultivating Creativity With Clay | 978-0-9628481-7-9 (0-9628481-7-4) | 2008 |
| The Spirit of Clay: A Classic Guide to Ceramics | 978-0-9628481-4-8 (0-9628481-4-X) | 1998 |
| Treasures of the Creative Spirit | 978-0-9628481-3-1 (0-9628481-3-1) | 1998 |