
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.
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https://archive.org/details/cihm_38484
psychedelics/langsdorff-voyages-1814.pdf
SHA-256: da391bf06bea9160212fcd851977cf5f71f60bd3ff4966493bd61a73deda36d4
Catalogue reviewed 19 September 2026. Original scans retained; catalogue labels do not endorse historical claims.