Worldcat is a comprehensive catalog of books and other materials held in libraries throughout the United States and even some international libraries. The Center for Research libraries' catalog contains more than 500,000 monographs in all formats and subject areas. Europeana searches European libraries, archives, museums, and galleries.
15th to early 20th century primary sources on gender such as Conduct and Politeness, Domesticity and Family, the Body, etc.
Medieval manuscripts of travelers' accounts between the 13th and 16th centuries.
Thousands of original materials related to slavery, abolition, and social justice ranging from 1490-2007.
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 CMU's 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"