| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| The Case for Mars: The Plan to Settle the Red Planet and Why we Must | 978-O-684-8193O-3 (O-684-8193O-9) | 1996 |
R.R. · R. Richard · Richard W. · Robert R. · Robert Richard · Robert W. · Robert W Richard · W R · W. Richard · W.W.