“Collected here in one volume are some thirty-six high quality translations into English of the most important foreign-language works in mathematical logic, as well as articles and letters by Whitehead, Russell, Norbert Weiner and Post…This book is, in effect, the record of an important chapter in the history of thought. No serious student of logic or foundations of mathematics will want to be without it.”-Review of Metaphysics“An invaluable work of reference and study. The selection of contents could hardly be bettered; those of the papers which were not originally in English have been admirably translated; and the editing of the book is impeccable in every way.”-New Scientist“This is an excellent selection of classical contributions to symbolic logic. The bringing together in English of so many important papers is in itself a major contribution… this book will long remain a standard work, essential to the study of symbolic logic.”-Library Journal