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. The European Library searches European national libraries.
NOTE: Due to Covid many libraries are restricting access. Currently the University of Pittsburgh requires a Pitt ID to enter their libraries while the Carnegie Library of Pittsburgh is open and requires masks.
Access to millions of primary source, cross-searchable, full-text/full-image documents on the most widely studied topics in 19th and 20th-century American history. Search or browse digitized letters, papers, photographs, scrapbooks, financial records, diaries, and many more primary source materials. Includes the “Confidential U.S. State Department Central Files, 1960–1969, Europe and Latin America” Collection Database Guide
1,800 works from some of the greatest legal minds in history.
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"