The Department of Nordic Languages and Literature at the University of Helsinki, in cooperation with two other institutions, made an expedition in 1971 to collect language and traditions of the Swedish-Finnish immigrants in the United States. About 600 people were interviewed. The material is deposited at Folkkultursarkivet in Helsinki, Finland (address: Ritarikatu 5, FIN-00170 Helsinki, Finland, phone +358-9-618777, telefax +358-9-61877277).

The collection is made up of 383 reels of tape recordings, about 4,300 pages of transcriptions, 182 photographs and many letters and other written material. The participiants are indexed in order of name and home area in Finland.