These tokens are normally used in timer mechanisms to give the user a set number of minutes of use of the washing facilities. Some are good for an entire (usually automated) carwash. They are still very popular and provide an alternative to using quarters - the public usually purchases tokens in multiple-dollar amounts from dispensing machines on the carwash premises. These tokens are collected by specialists or are included with a collection of trade tokens from a particular location. The standard reference catalog for these tokens is "Car Wash Tokens" by Harold V. Ford and John M. Coffee, Jr.