1973-1976
Mary Antonietti was Gustav Holst's niece by marriage (the daughter of Gustav Holst's wife's brother), and cousin to Imogen Holst.
File of correspondence and papers relating to Mary Anonietti's estate of which Imogen was chief legatee, and correspondence to Imogen Holst on Mary Antonietti's death.
1 file
Archive
https://www.bpacatalogue.org/archive/HOL-2-15-4