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Papers, letters, memoranda, memorabilia, and manuscript music scores assembled by and related to the life and musical activities of Anton Seidl. The collection includes many letters from Cosima Wagner and her children addressed to Anton Seidl and his wife, the opera singer Auguste Kraus Seidl. There are also letters from Lilli Lehman, Edvard Grieg, Antonin Dvorak, Bronislaw Hubermann, Carl Goldmark, Maud Powell, Marianne Brandt, Felix Weingartner, Lyman Abbott, and many others. The letters are chiefly concerned with musical performances, composition, and related affairs. There are journals, diaries, and memoranda in Seidl's hand, as well as photographs and clippings relating to his conducting career. Also, twenty-seven manuscript scores of Seidl's orchestrations of various works.

in 1792-1793. There are documents relating to several members of the Beloselśkiĭ-Belozerskiĭ family. The part of the collection concerning the Horse Guards primarily relates to emigre activities in Europe and America during the 1930s. The materials include manuscripts for a history of the Guards, biographical sketches, minutes, newsletters, orders and several hundred photographs, many of which date back to the mid 19th century. Among the printed materials are journals, illustrations and a number of scrapbooks. The collection also contains several dozen oversized albums, illustrations, documents and photographs.