Mengelberg, Willem. (1871–1951) & Dumont-Wilden, Louis. (1875–1963) Mengelberg's signature and autograph poem by Dumont-WildenDisbound bifolium. Autograph signature of the Dutch conductor and date, November 3, 1929, to fol. 1 recto. Autograph (unsigned) of a sonnet in French, "Ainsi qui au temps de Vrgile," by the Belgian poet with autograph dedication to "Madame et Monsieur Klein," to fol 1v. 7. 5 x 4. 75 inches (18 x 12. 2 cm). Notes in pencil in an unknown hand to the first two pages, providing information on Mengelberg and Dumont Wilden. A note in pencil dates the poem