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WikiPedia: William_Walton http://beinecke.library.yale.edu/digitallibrary/wa... http://www.library.yale.edu/beinecke/index.html http://www.waltontrust.org/ //www.worldcat.org/oclc/221594461 //www.worldcat.org/oclc/458571770 //www.worldcat.org/oclc/499119110 //www.worldcat.org/oclc/500373060 //www.worldcat.org/oclc/655768838 http://www.oup.co.uk/music/repprom/walton/ https://archive.org/details/isbn_9780193154124