There are many types of trade tokens, and a collector can specialize in various ways. The typical trade token was issued by a business and has "Good For" some amount of money "In Trade" on it. They were used for various reasons, including as substitutes for money, to extend credit, and to circumvent gambling laws. Trade tokens are often collected by geographical area, but topical collections from bakeries, saloons, cigar stores, general stores, etc. form interesting collections. There are a number of standard reference works for trade tokens, including catalogs of the tokens of many individual states and provinces. There are topical references as well for the specialty collector.