Other
Economic conditions
Social conditions
Economic history
3
Puerto Ricans
3
Emigration and immigration
2
History
2
Portoricains
2
Conditions économiques
1
Conditions sociales
1
Migration, Internal
1
Migrations
1
National characteristics, Puerto Rican
1
Philadelphia (Pa.)
1
Politics and government
1
Puerto Ricans in the United States
1
Puerto Rico
1