Daniel:

The only way that I have used the Guia General (with some success) is simply doing a text search of the document description. You can do so by:

- Going to the link I previosuly posted: http://www.agn.gob.mx/guiageneral/

- Click on "Guia General" from the top menu in the red bar, then on "Contenido de la Guia" (Content of the Guide)

- The lower part of the window will split into two frames. On the bottom of the left hand frame there is a button that reads "Buscar." Click on this button.

- Search fields will appear in the upper part of the left hand frame. Select the default "Alcance y Contenido" (Scope and Content). You can also search by title or date, but unless you know exactly what you are looking for I don't see how these are useful.

- Scroll down a bit to find the field labeled "Palabras a buscar" (Words to search) and type in your search criteria. For example, I simply typed "Colotlan" to get any document that mentioned Colotlan in the description and found a