Citations
Large abacus, c.1950s-1970s, GBR/1928/NRI/NRI2/8/3/2/7, Box NRI2/8/3/2/1-7. Needham Research Institute. |
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Large abacus, c.1950s-1970s, GBR/1928/NRI/NRI2/8/3/2/7, Box NRI2/8/3/2/1-7. Needham Research Institute. https://archivesearch.lib.cam.ac.uk/repositories/21/archival_objects/503168 Accessed November 23, 2024. |