Library of Congress Subject Headings (LCHS) reflect the subject content of materials. They facilitate the uniform access and retrieval of items in any library in the world using the same search strategy. Components of LCSH can also reflect an item’s genre, format, geography, population/group, and time period information.

The UI Libraries has primary sources in abundance. You will find many of them in the Special Collections & Archives and Iowa Women's Archives. However, beyond those to locations you will find millions, if not billions, of pages of published/digitized primary sources. 

You can use the keywords* below in combination with other search terms to locate primary sources in the InfoHawk+:

• autobiographies             
• correspondence
• diaries                             
• documents/documentary
• interviews                         
• letters                                       
• manuscripts                     
• memoirs                         
• oral histories                     
• personal narratives               
•  sources                           
• speeches

Remember: Creative works can be primary sources too - novels, songs, films, photographs, etc.

*not a comprehensive list

The Library of Congress Classification outline places books about the History of Mexico in range F1201-1392. Those books are located on the 4th floor, east side, of the Main Library.