Popocatepetl, the second highest volcano in Mexico, is a giant stratovolcano, 70 km (~45 miles) southeast of downtown Mexico City, and 45 km (~30 miles) southwest of the city of Puebla.
Guam Currency (code) Guam > Economy. Currency (code): US dollar (USD) Definition: This entry identifies the national medium of exchange and, in parenthesis, gives the International Organization for Standardization (ISO) 4217 alphabetic currency code for each country.
The Early Years. A method of barter was in common use by the native Chamorros long before the Spaniards arrived in Guam in the 16th century. Because of this barter system and the absence of commerce, there was no need for a coinage system in Guam during the first 150 years of Spanish rule.