This collection is made up of materials related to the research and personal lives of Max, Uriel, and Beatrice Weinreich. There is significant research on Yiddish linguistics and folklore, respectively related to each's research interests. Additionally there is personal correspondence between family members, including 14 audio letters between members in New York and Israel. The contents list of the materials in the collection is based on an initial inventory of folder headings as they existed upon accession. This collection has been minimally processed as of the creation of this finding aid.