found: Ancestry.com, June 28, 2017U.S. Social Security Applications and Claims Index, 1936-2007 (Franceska Kaspar Lawson, b. 19 January 1887, Washington, DC, m. Huron W. Lawson)
found: Scrapbook compiled by Francesca Kaspar Lawson, 1900:preliminary page (signed Francesca Mignon Kaspar in manuscript)
found: The musical blue book of America, 1919, viewed June 28, 2017vol. 4, p. 37 (Kaspar-Lawson, Madame Francesca, concert soprano)
found: The musical courier, Oct. 6, 1921, viewed June 28, 2017 :vol. 83, no. 14, p. 8 (Mrs. Francesca Kaspar Lawson; successful concert singer)
found: Washington Post obituary online, July 18, 2017(Mrs. Lawson, 80 [in 1967], former Franceska Kaspar, singer; died Sunday in Dover, Del.; widow of Dr. Huron W. Lawson; one of Washington's best known sopranos)