Citations
"Colour Light Signals", 1939, GBR/3296/Maps/Maps.RLY.2537 (3a), Maps.RLY.2537 (3a). Cambridge University Library. |
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"Colour Light Signals", 1939, GBR/3296/Maps/Maps.RLY.2537 (3a), Maps.RLY.2537 (3a). Cambridge University Library. https://archivesearch.lib.cam.ac.uk/repositories/2/archival_objects/267550 Accessed January 08, 2025. |