Columbia subject headings:
Civil rights--Puerto Rico--History--20th century--Sources.
English language--Study and teaching--Puerto Rico--History--20th century--Sources.
Language and education--Puerto Rico--History--20th century--Sources.
Mendoza, Inés María, 1908-1990--Correspondence.
Puerto Rico--Language--Political aspects--History--20th century--Sources.
Spanish teachers--Puerto Rico--Correspondence.
Teachers--Puerto Rico--Correspondence.
Harvard subject headings:
Civil rights--Puerto Rico--History--20th century--Sources.
English language--Study and teaching--Puerto Rico--History--20th century--Sources.
Language and education--Puerto Rico--History--20th century--Sources.
Mendoza de Muñoz Marín, Inés María--Correspondence.
Puerto Rico--Language--Political aspects--History--20th century--Sources.
Spanish teachers--Puerto Rico--Correspondence.
Teachers--Puerto Rico--Correspondence.
Princeton subject headings:
Authors, Puerto Rican--20th century--Correspondence.
Language policy--Puerto Rico.
Mendoza, Inés María, 1908-1990--Correspondence.
Spanish language--Political aspects--Puerto Rico.