Tutt Library Research Guides
A bibliography from a good secondary source is a great way to identify primary sources.
The following sites offer guides to citing primary sources in the Chicago style:
Citation at a Glance: Primary Source from a Web Site (Diana Hacker)
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
The Library of Congress uses the following subject headings for books about urban design and city planning. Your best bet is to do a subject search using these headings, but you may also want to do a keyword search too.