The University of Pittsburgh has a fantastic Latin American collection-see Latin American Resources @ Pitt: Eduardo Lozano Latin American Collection.
Thousands of original materials related to slavery, abolition, and social justice ranging from 1490-2007.
All known legal materials on slavery in the United States and the English-speaking world. This includes every statute passed by every colony and state on slavery, every federal statute dealing with slavery, and all reported state and federal cases on slavery, as well as every English-language legal commentary on slavery published before 1920, which includes many essays and articles in obscure, hard-to-find journals in the United States and elsewhere
Essays and original documents relating to Empire Studies, race, class, imperialism, and colonialism, sourced from libraries and archives around the world.
Thousands of original materials related to slavery, abolition, and social justice ranging from 1490-2007.
A rich resource containing all types of materials, many appropriate as primary sources. You can search the description of items (author's name, title, subject headings) as well as the full text of materials. Items that are outside copyright protection will be displayed in full text. Items are from all countries, in many different languages. Filters allow you to limit to language, date of publication, etc. Items can be downloaded by logging in with your Andrew user ID and password.
The resources listed here are not the only ones available. Many others are in print or microform and can be found by searching library catalogs, like the CMU library catalog or Worldcat, a database of library holding thoughout the world (though mainly U. S.). Use some of these terms combined with your topic:
personal narratives
diaries
sources
correspondence
interviews
pamphlets
speeches
early works to 1800
For example:
women and diaries
slavery and "early works"
Holocaust and "personal narratives"