Folder 4:8 contains letters from 1970-1986 found clipped together. Letters are from civic and cultural organizations, including the New York Public Library at Lincoln Center Library and Museum of Performing Arts, the Embassy of the Union of Soviet Socialist Republics, the Anna Pavlova Memorial Museum, the Joffrey Ballet, Sangamon State University, and others; the focus of the letters is appreciation for the work of Grell and of the Archive. Folder 4:9 contains correspondence from 1970; Folder 4:10 from 1971; Folder 4:11 from 1973; Folder 4:12 from 1974; Folder 4:13 from 1975; Folder 4:14 from 1975-1976; Folder 4:15 from 1976; Folder 4:16 from 1977; Folder 4:17 from 1978; and Folder 4:18 from 1979.