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Guidebooks are probably the most complete resource you can own about a country. They offer information about all kinds of sites, restaurants, hotels, little known facts. Though, since these general guidebooks hit on all kinds of topics they don't go too in-depth into anything. So if you are interested in a more detailed look at certain topics you can buy specialized travel books. Ones that features a certain area of the city. They might even be geared towards a certain audience like traveling for kids, senior citizens, people with disabilities. Both a general and a specialized book would probably be a smart buy. Since neither would overlap really each other.