Sčítání lidu obchodních námořníků v USA, 1930

"United States, Census of Merchant Seamen, 1930." Database. FamilySearch. http://FamilySearch.org : 23 August 2025. From "1930 Census of Merchant Seamen." Database and images. Ancestry. http://www.ancestry.com : 2005. Citing NARA microfilm publication T626. Washington, D.C.: National Archives and Records Administration, n.d.