four color theorem
By: by Joseph Miller Thomas.
Contributors: Thomas, Joseph Miller, 1898-
Edition: 3d ed.
Series: [American Mathematical Society colloquium publications -- v.21 su]; Colloquium publications (American Mathematical Society) -- v.21 su.
Published: 1972
Place of publication: Philadelphia
Language: eng
Subjects: Four-color problem
Notes: Supplement to the author's Systems and roots, published 1962.

Includes bibliographical references.