Columbia subject headings:
Authors, Mexican--20th century--Correspondence.
Guzmán, Martín Luis, 1887-1976--Correspondence.
Reyes, Alfonso, 1889-1959--Correspondence.
Harvard subject headings:
Authors, Mexican--20th century--Correspondence
Guzmán, Martín Luis, 1887-1976--Correspondence.
Reyes, Alfonso, 1889-1959--Correspondence.
Princeton subject headings:
Authors, Mexican--20th century--Correspondence.
Guzmán, Martín Luis, 1887-1976--Correspondence.
Reyes, Alfonso, 1889-1959--Correspondence.