Principia mathematica, vol. 1 (of 3), by Alfred North Whitehead           78050

  [Author: Alfred North Whitehead]

  [Author: Bertrand Russell]

  [Link: https://www.gutenberg.org/ebooks/78050]

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Thanks to Richard Tonsing, Laura Natal, Michael Roe and the Online

Distributed Proofreading Team at https://www.pgdp.net (This book was

produced from images made available by the HathiTrust Digital Library.)  In

memoriam of Greg Newby.

Regards,

Robert