I found a website where you can see ediciones of The Gazeta Newspaper 1785 of Mexico:
http://hemerotecadigital.bne.es/results.vm?q=parent%3A0004520440&s=0&la…
Comment
Here is another site to look up Zacatecas or other:
http://catalogo.bne.es/uhtbin/cgisirsi/2Iavja2SuX/BNMADRID/147010010/38…
Ediciones of Gazeta First