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The correspondence is divided into two subseries: A. Personal; and B. By Subject. The personal correspondence is arranged alphabetically by sender then chronologically. Copies and drafts of letters from Horowitz are filed with the recipient's correspondence and a note has been made in the register. Replies made in behalf of Horowitz by others such as Harold Shaw, Peter Gelb, and secretaries, are filed under Horowitz. This series includes correspondence to and from Vladimir Horowitz and Wanda Toscanini Horowitz, as well as from Sonia Horowitz, and to and from Arturo Toscanini. Original correspondence from Vladimir Horowitz to Wanda Toscanini Horowitz and Arturo Toscanini, and from Sonia Horowitz to Arturo Toscanini are listed under the authors' names. The correspondence in the second subseries is grouped by subject and listed chronologically with a chronological arrangement within each group. Fan mail is included in this subseries.