Columbia subject headings:
Education--Mexico--History--Congresses.
Harvard subject headings:
Book industries and trade--Mexico--History--Congresses.
Books and reading--Mexico--History--Congresses.
Reading--Mexico--History--Congresses.
Princeton subject headings:
Fundamental education--Mexico--History--Congresses.
Literacy--Mexico--History--Congresses.
Publishers and publishing--Mexico--History--Congresses.
Reading--Mexico--History--Congresses.
Spanish language--Mexico--Writing--History--Congresses.