H.C. Darby: Historical geography handbooks section, Cambridge, GBR/0012/MS Add.8701. Cambridge University Library.
H.C. Darby: Historical geography handbooks section, Cambridge, GBR/0012/MS Add.8701. Cambridge University Library. https://archivesearch.lib.cam.ac.uk/repositories/2/resources/7949 Accessed October 16, 2024.