The manuscript cited as "Borodin [1989c]" has appeared

O.V. Borodin, A new proof of the 6 color theorem,
*J. Graph Theory* **19**, 507-521, 1995.

August 12, 1997. Tommy R. Jensen

The manuscript cited as "Hutchinson [1994]" has appeared

J.P. Hutchinson, Three-Coloring Graphs Embedded on Surfaces with All
Faces Even-Sided,
*J. Combin. Theory Ser. B* **65**, 139-155, 1995.

August 29, 1997. Tommy R. Jensen

The manuscript cited as "Thomassen [1993c]" has appeared

C. Thomassen, Grötzsch's 3-Color Theorem and its Counterparts for the
Torus and the Projective Plane,
*J. Combin. Theory Ser. B* **62**, 268-279, 1994.

August 29, 1997. Tommy R. Jensen

The manuscript cited as "Youngs [1991]" has appeared

D.A. Youngs, 4-Chromatic Projective Graphs,
*J. Graph Theory* **21**, 219-227, 1996.

August 29, 1997. Tommy R. Jensen

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