Citations
'Conventional symbols for use by photographic interpreters', 1943, GBR/3296/Maps/CCSA.IM_501_10, IM_501_10. Cambridge University Library. |
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'Conventional symbols for use by photographic interpreters', 1943, GBR/3296/Maps/CCSA.IM_501_10, IM_501_10. Cambridge University Library. https://archivesearch.lib.cam.ac.uk/repositories/2/archival_objects/240014 Accessed May 15, 2025. |