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.
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Primary Source
A letter is a primary source.
it is a primary source because it wasnt real
A primary source might be a letter, photograph, or speech that
When researching American independence or almost any founding-period subject, the Declaration of Independence is indeed a primary source. The difference between primary sources and secondary sources hinges on this simple distinction: a primary source is (or was) "there", while a secondary source is (or was) not "there" but instead talks "about" it.