I have posted Volume Three of Families of Santiago, Nuevo Leon Mexico book online. Find the link below.
Volume three ends in mid 1831. This is the final volume for Santiago. Should FamilySearch.org ever post the images for the remainder of 1831 to 1841. I would like to continue the series. I decided not to wait for that to happen.
This book is 400 pages so it may take some time for the file to appear. In the future I should consider fewer families in each volume.
Families of Santiago, Nuevo Leon, Mexico Volume Three