If you're studying a Virginian, you're especially lucky that the main university library has the Virginia Historical Index, created by W&M Librarian Earl Gregg Swem. The Index will indicate every time a notable Virginia was cited in:
It is an excellent way to find reprinted primary sources about historically important Virginians during the Colonial period. The index & reference materials on the main floor of the library in the reference collection.
Example:
Note: The online version doesn't link out to every citation and is, in my opinion, actually a bit harder to use than the print.