This is the archive upon which the Language and Culture Atlas of Ashkenazic Jewry (LCAAJ) is based, whose history is described in more detail here. The archive is a crucial resource for scholars analysing the Yiddish language and its history.
From the website:
"This project collects and preserves data reflecting the language and culture of the Yiddish speaking populations of Central and Eastern Europe at the start of World War II.
The collection includes tape recordings and partial transcripts. A questionnaire was used to interview a geographical range of informants. The resulting tape recordings have been partially transcribed and indexed. The Language and Culture Atlas of Ashkenazic Jewry is an ongoing publication project based on the data collected in this study."