Columbia subject headings:
Endangered languages--Mexico--Congresses.
Nahuatl language--History--Congresses.
Nahuatl language--Usage--Congresses.
Ocuiltec language--Usage--Congresses.
Science--Language--Congresses.
Spanish language--Latin America--Usage--Congresses.
Spanish language--United States--Congresses.
Harvard subject headings:
Conference papers and proceedings
Endangered languages--Mexico--Congresses.
Nahuatl language--History--Congresses.
Nahuatl language--Usage--Congresses.
Ocuiltec language--Usage--Congresses.
Science--Language--Congresses.
Spanish language--Latin America--Usage--Congresses.
Spanish language--United States--Congresses.
Princeton subject headings:
Conference papers and proceedings.
Endangered languages--Mexico--Congresses.
Nahuatl language--History--Congresses.
Nahuatl language--Usage--Congresses.
Ocuiltec language--Usage--Congresses.
Science--Language--Congresses.
Spanish language--Latin America--Usage--Congresses.
Spanish language--United States--Congresses.