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11 hours ago · Pennsylvania is a state in the northeastern United States with a rich and diverse history, culture, and natural features. Learn about its colonial origins, role in the American Revolution and Civil War, geography, population, state symbols, and more.
11 hours ago · Sand casting is one of the oldest and most versatile metal casting processes, employing a mixture of sand, clay, and water to create molds for metal casting. This method is partic
