A primary source might be a letter, photograph, or speech that
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A letter is a primary source.
secondary
Primary Source
They are usually secondary sources, but can be a primary source depending on the topic of the dissertation. If you are looking for primary sources you might be able to find many primary sources within the bibliography of a dissertation, since most of these scholars would have most likely referred to primary documents while drafting their dissertation.
it is a primary source because it wasnt real