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APA Citation
Unknown (2020). The history of celestial navigation rise of the Royal Observatory and nautical almanacs. Cham : Springer. http://access.bl.uk/ark:/81055/vdc_100102719432.0x000001
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Unknown (2020). The history of celestial navigation rise of the Royal Observatory and nautical almanacs. Cham : Springer. http://access.bl.uk/ark:/81055/vdc_100102719432.0x000001