| Author: | Ferris, J. R., Lieutenant |
| Subject: | UG, Intrenchments |
| Format: | Text |
| Date issued: | 2019 |
| Language: | English |
| Publisher: | Project Gutenberg, |
| Rights: | Public domain in the USA. |
| Download link: | Bombers' Training, and Application of Same in Trench Warfare [electronic resource] / J. R., Lieutenant Ferris |