A collection of materials related to the research project of the Language and Culture Atlas of Ashkenazic Jewry (L.C.A.A.J./LCAAJ) produced from 1949 to 1997. The project was spearheaded by Columbia University's Yiddish department and the primary researchers involved in the project were Uriel Weinreich, Marvin (Mikhl) Herzog, Mordkhe Schaechter, Vera Baviskar, Robert Neumann, and Ulrike Kiefer. The materials include administrative records, fieldwork and research notes, materials relating to the publication of the second and third volume of the Atlas, as well as other research materials of Uriel Weinreich, and materials related to the publication of The Field of Yiddish. The materials are primarily in English, Yiddish and German.