51. Peirce and Spencer-brown
by Kauffman, Louis (EDT)/ Brier, Soeren (EDT) 
Price: USD 19.99
Dealer: Abebooks, Russell Books
Description: ISBN10: 1845401050, ISBN13: 9781845401054, [publisher: Imprint Academic] Softcover [Victoria, BC, Canada] [Publication Year: 2007]