Four Colors

VIDOL

Four Colors                                      

Four Colors                                      

GRACE NOTES RECORDS

Four Colors                                      

FOUR COLOR: Santa Claus Funnies No. 958          

Princeton University Press

Four Colors Suffice: How the Map Problem Was Solved: Revised Color Edition

Doghouse Records

Four Color Problem                              

Council Records & Protagonist Music

Four Color Black                                

Four Colors Suffice: How the Map Problem Was Solved by Robin Wilson (2004-11-07)

The Four-Color Puzzle: Falling Off the Map by Lior Samson (2014-01-01)

FRESH SOUND

Jazz in Four Colors