"Social security in the United States, 1939; a record of the twelfth National conference on social security, New York city, April 14 and 15, 1939"@en
"Social security in the United States, 1939; a record of the twelfth National Conference on Social Security, New York City, April 14 and 15, 1939, together with a census of social security in the United States"@en
National Conference on Social Security (12th : 1939 : New York, N.Y.)
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