'Tractatus Geographicus': Treatises on Geography and Harmonics, GBR/0012/MS Add.8987, Volume: Add.8987. Cambridge University Library.
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'Tractatus Geographicus': Treatises on Geography and Harmonics, GBR/0012/MS Add.8987, Volume: Add.8987. Cambridge University Library. https://archivesearch.lib.cam.ac.uk/repositories/2/resources/8181 Accessed April 19, 2024.
