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Menu is a list meals or options that one can order for breakfast, lunch or dinner. Most menus have various choices of food, from appetizers to the main course to dessert.
The hobby of collecting restaurant menus is fairly new. Collectors usually collect vintage menus of the 1930s, 1940s and 1950s from their home town or home state or from restaurants they visted. In addition menus from famous hotels and cruise ships during the 1920's are very popular.
Your best source for menus is eBay. Restaurant menus of all styles and classes of trade are represented, from lunch counters to first class gourmet restaurants. Also included travel-related menus from ships, railroads, and airplanes.