Continent Codes from the FAO/UNESCO Soil Map of the World

 0 OCEAN
 1 not used
 2  N (NAM)  N America
 3  C (MCA)  Mexico/Central America
 4  S (SAM)  S America
 5  E (EUR)  Europe  
 6  A (AFR)  Africa  
 7  I (SCA)  SC Asia  
 8  U (NCA)  NC Asia  
 9  E (SEA)  SE Asia  
 10 T (AUS)  Australia

Continent codes correspond to volume numbers of the FAO/UNESCO
Soil Map of the World (1971-81).