The collection mostly covers the activities of the Evangelical Union of South America and related mission and church organisations. Some more recent material related to the formation of Latin Link is also included. A minority of material has been generated by predecessor societies to EUSA, and those with which EUSA was to amalgamate. The material covers the activities of EUSA as an organisation and individual missionaries in the United Kingdom and in Peru, Brazil, Argentina and Bolivia, although other Latin American nations are represented. The collection comprises of:
- Foundation documents and policy papers
- Meeting minutes and associated correspondence and reports
- Official correspondence
- Personnel files for individual missionaries
- Prayer letters and reports written by individual missionaries working in South America
- Field minutes, reports and articles for publication
- Educational materials, including slides, cinefilm, audio cassettes and written material
- Teaching materials in Spanish, Portuguese and Quechua
- Photographs of South America, evangelical institutions and individual missionaries
- Glass plate negatives and lantern slides
- Evangelical pamphlets written by missionaries
- Periodicals