The category of "Civilization" in books encompasses works that explore the development, evolution, and impact of human societies and cultures throughout history. These books may cover topics such as politics, economics, religion, art, and technology, and may examine the rise and fall of civilizations, the interactions between different cultures, and the ways in which societies have shaped and been shaped by their environments. Overall, the category of "Civilization" offers a broad and fascinating perspective on the human experience and the complex forces that have shaped our world.

The category of "Time travel" books typically involves stories where characters travel through time, either intentionally or accidentally, to different eras or periods in history. These books often explore the consequences of altering the past or future, and the challenges and dangers that come with navigating different time periods. Time travel books can span a variety of genres, including science fiction, historical fiction, romance, and adventure, and offer readers a unique perspective on the possibilities and complexities of time travel.

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