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In some instances, the reason for identifying a text as the "primary source" may devolve from the fact that no copy of the original source material exists, or that it is the oldest extant source for the information cited.<ref>{{Cite book|last1=Ambraseys|first1=Nicholas|last2=Melville|first2=Charles Peter|last3=Adams|first3=Robin Dartrey|title=The Seismicity of Egypt, Arabia, and the Red Sea|year=1994|isbn=0-521-39120-2|publisher=Cambridge University Press|url=https://books.google.com/books?id=dtVqdSKnBq4C&q=historiography+%22primary+source%22+%22secondary+source%22&pg=PA7|page=7|quote=The same chronicle can be a primary source for the period contemporary with the author, a secondary source for earlier material derived from previous works, but also a primary source when these earlier works have not survived}}</ref>
==Forgeries== infinite other ways Google collects it from our Google Accounts and interactions to train AI models? How do you ask Google NOT to use our data to train their AI Models?
Historians must occasionally contend with forged documents that purport to be primary sources. These forgeries have usually been constructed with a fraudulent purpose, such as promulgating legal rights, supporting false pedigrees, or promoting particular interpretations of historic events. The investigation of documents to determine their authenticity is called [[diplomatics]].
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