Found a document that is dated 1618 and talks about the herrederos of the Haciendas of Sombrerete, Zacatecas, Mexico.
The reference no. is: MEXICO,29,N.11
To enter in Pars website:
http://www.archivesportaleurope.net/web/guest
It starts on pg 9 in regards to Sombrerete and continues on after each page.
1618 Document Testamento of
MADERA_32
What is interesting this document starts out talking about "Negros Cimarrones" (Rebeldes).
Then on Pg 9, is when it shifts over to Sombrerete, The Testamento.
http://oi57.tinypic.com/oa7rx0.jpg