
1847 / Book or monograph
A Code of Signals ... in the Merchant Service
Communication, telegraphy and codes · Navigation, seamanship and maritime practice
271 pages Open documentOpening preserved document…

Bibliographic identity checked against available scan and source evidence.
obscure/harrison-remarks-1767.pdf
SHA-256: 266cca2a932a0fff55eb1ba8fe605cc955e82845b6018997d10524ed028c5ffe
Catalogue reviewed 19 September 2026. Original scans retained; catalogue labels do not endorse historical claims.