Columbia subject headings:
Communists--Brazil--Correspondence.
Political activists--Brazil--Correspondence.
Prestes, Luís Carlos, 1898-1990--Correspondence.
Harvard subject headings:
Communists--Brazil--Correspondence.
Political activists--Brazil--Correspondence.
Political prisoners--Brazil--Correspondence.
Prestes, Luís Carlos, 1898---Correspondence.
Prestes, Luís Carlos, 1898-1990--Correspondence.
Princeton subject headings:
Communists--Brazil--Correspondence.
Political activists--Brazil--Correspondence.
Political prisoners--Brazil--Correspondence.
Prestes, Luís Carlos, 1898-1990--Correspondence.