Stefan Banach’s famous monograph, Théorie des opérations linéaires, which gave birth to the field of Banach spaces, is available online.
Stefan Banach’s famous monograph, Théorie des opérations linéaires, which gave birth to the field of Banach spaces, is available online.
I think quite a few others are also available on that site, e.g. _Analytic Functions_ by Saks and Zygmund.
Frank Jellett’s translation into English is available in the Dover Catalogue.