There are a growing number of impressive digital projects to make historical documents and visual materials freely available online. Below are a few examples. Check the websites of relevant national institutions and universities.
The UI Libraries own many volumes of primary sources that have been collected and edited for publication. Some include facsimile images of the original documents and some include transcriptions. Most are only available in Spanish, though some are available translated into English.
Subject headings are useful to narrow a search for primary sources. Common terms include collected works, correspondence, description and travel, diaries, interviews, manuscripts, personal narratives, and sources. For example:
America -- Discovery and exploration -- Spanish -- Collected works.
Mistral, Gabriela, 1889-1957 -- Correspondence.
Puerto Rico -- Description and travel -- Early works to 1800.
Guevara, Ernesto, 1928-1967 -- Diaries.
Authors, Panamanian -- 20th century -- Interviews.
Borges, Jorge Luis, 1899-1986 -- Manuscripts -- Facsimiles.
Cuba -- History -- Revolution, 1959 -- Personal narratives.
Yucatán Peninsula -- History -- Sources.
Use the advanced search in InfoHawk: