| title | media type | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|---|
| Crossing the Threshold: Advancing Into Space to Benefit the Earth | Hardcover | 978-0-9825127-0-8 (0-9825127-0-8) | 2010 |
| Crossing the Threshold: Advancing Into Space to Benefit the Earth | Paperback | 978-0-9825127-1-5 (0-9825127-1-6) | 2010 |
O.P. · O.W. · O. Wieland · P.O.W. · P.P. · P W. · Paul O. · Paul O. W. · Paul P. · Paul W. · Paul Wieland · W.P.