Below is a comprehensive list of cities and airports throughout the world. In the list are many locations where you most likely enter a country. The list shows 3-letter location identifier codes predominantly for airports and some cities as well.
A list of codes and names of all the shipping ports that participate in international trade.
Due to the varying characteristics and nature of dangerous goods, they are classified in to 9 classes and some classes are classified into divisions as following
CountryCode.org is your complete guide to make a call from anywhere in the world, to anywhere in the world. This page details Vietnam area & phone code.
List of International Dialing Codes and Country Codes
Qunicoship gives you a quick reference guide to ensure you never get tied up in transport terminology again.