Trade your worldwide stamps in 5 1/2 x 8 1/2 booklets with 25 other exchangers in the US and Canada. You place stamps you want to trade in the books and then the books are circulated to other exchangers. About half of the members collect European countries and their colonies, Asia, the US possessions, and the other half collects worldwide. Some collect only earlier stamps pre-1970s, some after, and some both. I am posting a few sample pages. Contact me for an application and the exchange rules.