TY  - BOOK
AU  - Wilson, Robin 
TI  - Four colors suffice: how the map problem was solved 
SN  - 9780141009087
AV  - QA 612.19 .W746 2002
U1  - IB 511.5  
PY  - 2002///
CY  - Princeton, NJ 
PB  - Princeton University Press
ER  -