Alan Day: postgraduate notebooks, Department of Geodesy and Geophysics, c.1955, GBR/0012/MS Add.9870. Cambridge University Library.
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Alan Day: postgraduate notebooks, Department of Geodesy and Geophysics, c.1955, GBR/0012/MS Add.9870. Cambridge University Library. https://archivesearch.lib.cam.ac.uk/repositories/2/resources/9133 Accessed January 04, 2025.
