I am trying to collect all available letters written or received by Cantor or written between his colleagues about Cantor. I have searched already the literature given below. But I would like to collect further ressources. Thank you.
E. Zermelo: "Georg Cantor, Gesammelte Abhandlungen mathematischen und philosophischen Inhalts", Springer, Berlin (1932). https://gdz.sub.uni-goettingen.de/id/PPN237853094
E. Noether, J. Cavaillès: "Briefwechsel Cantor-Dedekind", Hermann, Paris (1937).
Jean van Heijenoort: "From Frege to Gödel - A Source Book in Mathematical Logic, 1879-1931", Harvard University Press, Cambridge (1967). https://www.hup.harvard.edu/books/9780674324497
I. Grattan-Guinness: "The correspondence between Georg Cantor and Philip Jourdain", Jahresbericht der Deutschen Mathematiker-Vereinigung 73 (1971) 111-130. https://eudml.org/doc/146602
I. Grattan-Guinness: "The rediscovery of the Cantor-Dedekind correspondence", Jahresbericht der Deutschen Mathematiker-Vereinigung 76 (1974) 104-139. https://eudml.org/doc/146637
H. Meschkowski: "Georg Cantor: Leben, Werk und Wirkung", 2nd ed., Bibliographisches Institut, Mannheim (1983). https://www.google.com.au/books/edition/Georg_Cantor/LPzuAAAAMAAJ?hl=en
W. Scharlau: "Rudolf Lipschitz: Briefwechsel mit Cantor, Dedekind, Helmholtz, Kronecker, Weierstrass und anderen", Vieweg, Braunschweig (1986). https://doi.org/10.1007/978-3-663-14205-8
W. Purkert, H.J. Ilgauds: "Georg Cantor 1845-1918", Birkhäuser, Basel (1987). https://doi.org/10.1007/978-3-0348-7411-3
J.W. Dauben: "Georg Cantor: His mathematics and philosophy of the infinite", Princeton University Press, Princeton (1990). https://www.google.com.au/books/edition/Georg_Cantor/8m3dDwAAQBAJ?hl=en&gbpv=0
H. Meschkowski, W. Nilson: "Georg Cantor – Briefe", Springer, Berlin (1991). https://doi.org/10.1007/978-3-642-74344-3
R. Ziegler: "Georg Cantor und Rudolf Steiner", Beiträge zur Rudolf Steiner Gesamtausgabe, Dornach, Nr. 114/115 (1995). (German original, English translation)
C. Tapp: "Kardinalität und Kardinäle", Franz Steiner Verlag, Stuttgart (2005). https://www.steiner-verlag.de/en/Kardinalitaet-und-Kardinaele/9783515086202
J. Ferreirós: "Paradise Recovered? Some Thoughts on Mengenlehre and Modernism" (2008). (author's draft pdf)
B. Russell: "Autobiography", Routledge, London (2009). https://www.routledge.com/Autobiography/Russell/p/book/9780415473736