found: Her Carlyle's translation of Wilhelm Meister, 1926.
found: Homelands : southern Jewish identity in Durham-Chapel Hill and North Carolina, 2007:page 164-165 (Olga Marx, William Perlzweig's wife, published poetry and translations of classical literature under her maiden name)
found: Danmark Census, 1925, via FamilySearch, 3 July 2018(Olga M. Perlzweig, born 15 February 1894, U.S. citizen, wife of William A. Perlzweig)
found: New York City births, via FamilySearch, 3 July 2018(Olga Josephine Marx, born 15 February 1894 in Manhattan)
found: Rilke and Andreas-Salomé: a love story in letters, 2008:page 387 (Olga Marx = the poet Carol North Valhope)
found: FamilySearch, 3 September 2020(Olga Marx; Olga Marx Perlzweig; recorded as still living in New York City as of 1977)