by United States

1929

by United States. Children's Bureau

1960

by United Mine Workers of America

1917

by United States. Congress. Senate. Committee on Education and Labor

1921

by United States. Children's Bureau

1920

by United States. Children's Bureau

1924

by United States. Congress. House. Committee on Labor

1911

by United States. Children's Bureau

1923

by United States. Children's Bureau

1914

by United States

1928

by United States. Department of Labor

1918

by United States. Bureau of the Census

1923