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What are the four main points of review a historian should perform when using External Criticism?
1. Is the source understandable?
2. What : Is the source a government document, a letter, a photograph, an advertisement, a memoir, a non-fiction trade book?
3. The source must be located in time and space.
--Where was is created?
--When was it created ?
--Who created it
This can be determined by a dated document or by what the document references.
4. Check for authenticity: Do you notice any idiosyncrasies or anachronisms in the text that could prove it false?