G.S. · G. Schumacher · Gerald E. Schumacher
| title | ISBN-13 | year of publication |
|---|---|---|
| Holding the Line: War Stories of the U.S. Border Patrol | 978-0-7603-2806-4 | 2009 |
| Hunting al Qaeda: A Take-No-Prisoners Account of Terror, Adventure, and Disillusionment | 978-0-7603-2252-9 | 2005 |
| Therapeutic Drug Monitoring | 978-0-8385-8946-5 | 1995 |
| To Be a U.S. Army Green Beret | 978-0-7603-2107-2 | 2005 |