Cipher and secret letter and telegraph code, with Hogg's improvements. The most perfect code ever invented or discovered. Impossible to read without the key. Invaluable for secret, military, naval, and diplomatic services, as well for brokers, bankers…
Book details
- Title
- Cipher and secret letter and telegraph code, with Hogg's improvements. The most perfect code ever invented or discovered. Impossible to read without the key. Invaluable for secret, military, naval, and diplomatic services, as well for brokers, bankers…
- Publication year listed
- 1884
- Format
- Public domain eBook
- Reading access
- Free online reader; no registration required
- Source record
- View on Archive.org
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