Citations
"Plan of Northumberland coal field", 1910, GBR/3296/Maps/Maps.RLY.DC.20, Maps.RLY.DC.20. Cambridge University Library. |
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"Plan of Northumberland coal field", 1910, GBR/3296/Maps/Maps.RLY.DC.20, Maps.RLY.DC.20. Cambridge University Library. https://archivesearch.lib.cam.ac.uk/repositories/2/archival_objects/267419 Accessed January 12, 2025. |