Philosophy of Advanced Music (1941), 106, MSS No. 29A, Series XI.A. Miscellaneous Writings by Others, Box 191, Folder 1, Virgil Thomson Papers, Yale Music Library.
Philosophy of Advanced Music (1941), 106, MSS No. 29A, Series XI.A. Miscellaneous Writings by Others, Box 191, Folder 1, Virgil Thomson Papers, Yale Music Library.