R. H. · R. Helfer · Ralph D. Helfer · Ralph H.
| title | media type | ISBN-13 | year of publication |
|---|---|---|---|
| Modoc: The True Story of the Greatest Elephant That Ever Lived | Paperback | 978-0-06-092951-0 | 1998 |
| Modoc: The True Story of the Greatest Elephant That Ever Lived | Hardcover | 978-0-06-018257-1 | 1997 |
| The Beauty of the Beasts | Paperback | 978-0-7592-2874-0 | 2002 |
| The Beauty of the Beasts: Tales of Hollywood's Wild Animal Stars | " | 978-0-06-113678-8 | 2007 |
| The World's Greatest Elephant | Hardcover | 978-0-399-24190-1 | 2006 |
| Zamba | Paperback | 978-0-06-083627-6 | 2005 |
| Zamba: The True Story of the Greatest Lion That Ever Lived | " | 978-0-06-076133-2 | 2006 |
| Zamba: The True Story of the Greatest Lion That Ever Lived | Hardcover | 978-0-06-076132-5 | 2005 |
HarperCollins · Penguin Putnam · e-reads.com