Konstantin Tsiolkovsky, The Exploration of Cosmic Space by Means of Reaction Devices (1903)
Georg Simmel, The Metropolis and Mental Life (1903)
W. E. B. Du Bois, The Souls of Black Folk (1903)
G. E. Moore, Principia Ethica (1903) and The Refutation of Idealism (1903)
Hans Jonas (May 10)
Theodor W. Adorno (September 11)
Otto Weininger (October 4)
Theodor Mommsen (November 1)
Herbert Spencer (December 8)
1903 in philosophy Wikipedia (Text) CC BY-SA
