A bibliography from a secondary source is a great way to find primary sources.
To find primary sources, try using these terms in keyword searches:
Keyword Searchesslavery and speeches
women and diaries
colorado and oral history
Author SearchesLincoln, Abraham
Use all variations of a keyword.
Words change over time. Today we say Civil War but, in the past, it has been called the
If you searched only the term Civil War, you might miss valuable documents written during a different era.
The Library of Congress Authorities and Vocabularies thesaurus will help you find variations of keywords and subject headings.