Wikimedi'Òc

Russell, Whitehead - Principia Mathematica to 56.jpg - Malts y

Russell PM 1+1=2.png - Wvbailey

Russell, Whitehead - Principia Mathematica, vol. II, 1912.djvu - Marc

Russell, Whitehead - Principia Mathematica, vol. I, 1910.djvu - Marc

Principia Mathematica 54-43.png - PtQa

Russell, Whitehead - Principia Mathematica, vol. I, 1910 page 8 CUP logo.png - AuFCL

Principia Mathematica List of Propositions.pdf - Millennium bug

Newton's Principia (38938934445).jpg - Eyes Roger

Revisionstoprincipia.jpg - Hochithecreator