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Primary sources are original materials from the time period involved and have not been filtered through interpretation or evaluation. Primary sources are original materials on which other research is based. They are usually the first formal appearance of results in physical, print, or electronic format. They present original thinking, report a discover, or share new information. The definition of a primary source may vary depending on the discipline or context.
A secondary source interprets and analyzes primary sources. These sources are one or more steps removed from the event. Secondary sources may have pictures, quotes or graphics of primary sources in them. Some types of secondary sources include: