Some sentences on material sources
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I don't know which material source you want,but i have sent you historical material source.
1.Historical source (also known as historical material or historical data) is original source that contain important historical information.
2.These sources are something that inform us about history at the most basic level, and these sources used as clues in order to study history.
3.Materials can be classified into four main groups: metals, polymers, ceramics, and composites.
4. Metals are materials on the left side of the periodic table of chemistry and include ferrous metals that have iron inside them (including steel) and nonferrous metals that don't.
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