Whitehead - Principia Mathematica Volume One - paperback or softback - X555z

Newton - Principia - New paperback or softback - X555z

Anonymous - Mathematica - New paperback or softback - X555z

Malaclypse the Young - Principia Discordia - paperback or softback - X555z

Thomas MD - Principia Senescentis - New paperback or softback - X555z

Halliwell - Kara Mathematica - New paperback or softback - X555z

Pardies - Opera Mathematica - New paperback or softback - X555z

Smith - Principia Latina - paperback or softback - X555z