R. T. ยท R. Townsend
| title | ISBN-13 | year of publication |
|---|---|---|
| Boeing 737 Study Guide, 2020 Edition | 978-1-946544-25-4 | 2019 |
| Boeing 757-767 Study Guide, 2019 Edition | 978-1-946544-17-9 | 2018 |
| Boeing 757-767 Study Guide, 2020 Edition | 978-1-946544-26-1 | 2019 |
| Boeing 777 Study Guide, 2019 Edition | 978-1-946544-18-6 | 2018 |
| Boeing 777 Study Guide, 2020 Edition | 978-1-946544-27-8 | 2019 |
| McDonnell Douglas-Boeing MD-80 Study Guide, 2019 Edition | 978-1-946544-19-3 | 2018 |
| McDonnell Douglas-Boeing MD-80 Study Guide | 978-1-946544-28-5 | 2019 |