RUSSELL, Bertrand. The Principles of Mathematics. Cambridge: University Press, 1903. Vol. I (all published), 8o. Original blue cloth, gilt-lettered on spine. FIRST EDITION. -- The Scientific Outlook. London: Allen & Unwin, 1931. 8o. Original cloth; dust jacket. FIRST EDITION. -- Introduction to Mathematical Philosophy. London and New York: Allen & Unwin and Macmillan, 1938. 8o. Original cloth. Later printing, SIGNED BY RUSSELL on the front free endpaper. (3)