Many books on the Economic aspects of various ethnic / culture groups, or issues or events, or countries / regions, will be found under other call numbers. Use the Library Catalog to search for these books by keyword.
One sample search might be something like: Brazil AND econom* Or just a single word: poverty
The asterisks at the end of the word are truncation features, and allow you to pick up variations of the word:
economy or economies or economic or economics without having to type out separately all the variations of a word.
Outline of the Library of Congress Classification System (what COD uses to arrange its books on the shelves).