It is wise to call different companies to compare prices. There is also a special rate for mailing books to other countries. Contact the Post Office for these rates and packaging procedures. Certified mail is available for use within the United States only. It is mail with a receipt which assures special handling to the point of destination.
Registered mail is available for all countries.
It is a protected form of delivery. The letter is kept in a safe until it arrives at its destination. Within the United States, send either a personal check or a United States money order. To send United States money abroad, a certified check can be purchased. International money orders are also purchased at the main Post Office.