Primary sources can be found in a variety of library tools:
For specific search strategies, see the Library's Guide to Finding Historical Primary Sources
Learn more about your topic in advance:
lesbian*. (pull down "Entire Collection" menu to Bancroft Library)
click on added title: Sexuality and Gender collection
chican* or latino* or latina*. (pull down "Entrire Collection" menu to Archival collections - BUT you will also retrieve UC Berkeley dissertations this way)
Lexis-Nexis Congressional includes:
United States Census
Public Opinion Polls
Supreme Court cases
See UCB Library guide: US Judicial Branch (Courts)
http://supreme.justia.com/ by year
A fully searchable collection of briefs and other documents related to cases brought before the U.S. Supreme Court. It contains over 150,000 cases and 350,000 documents. Search results are linked to the actual full-text PDF documents.
Lexis-Nexis Academic (Supreme Court briefs 1936 - onwards).
click on Advanced Options; in the window that appears, next to Source, enter U.S. Supreme Court Case Briefs; accept the suggested text; click on Apply
back at the search screen, enter your additional search terms; your search will be limited to Supreme Court briefs.