| Author: | Grant, Hamil, 1892- |
| Subject: | HV, Spies, Secret service |
| Format: | Text |
| Date issued: | 2015 |
| Language: | English |
| Publisher: | Project Gutenberg, |
| Rights: | Public domain in the USA. |
| Download link: | Spies and Secret Service : The story of espionage, its main systems and chief exponents [electronic resource] / Hamil Grant |