Primary sources in Primo are marked by certain endings to their subject headings.
These endings include:
-- Correspondence
ex: Lincoln, Abraham, 1809-1865 -- Correspondence
-- Interviews
ex: African Americans -- Interviews
-- Pictorial Works
ex: Douglass, Frederick, 1818-1895 -- Pictorial works
-- Personal narratives
ex: United States -- History -- Civil War, 1861-1865 -- Personal narratives
-- Sources