Schwarzenberg, Anna, 1897-1954.

Anna Schwarzenberg was a daughter of Jan Nepomuk Adolf Fürst zu Schwarzenberg (1860-1938) and Gräfin Therese von und zu Trauttmansdorff-Weinsberg (1870-1945). She was a younger sister of Adolf and Ida Schwarzenberg. Of the siblings, at least Adolf and Anna had emigrated to the U.S. Anna was living in New York City.

From the description of Correspondence to Alma Mahler, 1942, 1945. (University of Pennsylvania Library). WorldCat record id: 155864446