"U.S., Passport Applications, 1795–1925," database with images, Ancestry (https://www.ancestry.com/search/collections/1174) > Passport Applications, January 2, 1906 - March 31, 1925 > 1921 Roll 1594 - Certificates: 29250-29625, 04 May 1921-05 May 1921 > 1mages 475–6, application for Mary Elizabeth Sibert.