Other
Emigration and immigration
History
6
Social conditions
5
Immigrants
4
Ethnic relations
3
Émigration et immigration
3
Histoire
3
Puerto Ricans
3
Communauté
2
Community life
2
Conditions sociales
2
Migrations
2
Portoricains
2
Américains d'origine allemande
1
Economic conditions
1
Employees
1
German Americans
1
Jews
1
Jews, East European
1
Labor and laboring classes
1
Labor unions
1
Philadelphia (Pa.)
1
Political refugees
1
Puerto Rico
1