Principia Mathematica was first published in 1910-13; this is the ninth impression of the second edition of 1925-7. The Principia has long been recognised as one of the intellectual landmarks of the century. It was the first book to show clearly the close relationship between mathematics and formal logic.  No other book has had such an influence on the subsequent history of mathematical philosophy.  Paperback, good condition.

Whitehead & Russell (1973) - Principa Mathematica to *56