UNAM Historic Archive
The Historic Archive treasures different documents like handwritings, mechanoscripts, engraving, positive and negative photographic, among other ones. Just about photographic documents, the Historic Archive has, on average, 1,300,000 pictures.
Among the collections of the Historic Archive we can find “The Construction of University City” by Armando Salas Portugal. In 96 pictures he shows the newly built university campus in the first stage and it is free available in this repository.