Columbia subject headings:
Harvard subject headings:
Entomology--Southern States--Congresses.
Insect populations--Congresses.
Insect populations--Southern States--Congresses.
Insects--Migration--Congresses.
Insects--Seasonal distribution--Congresses.
Lepidoptera--Congresses.
Lepidoptera--Migration--Southern States--Congresses.
Lepidoptera--Seasonal distribution--Southern States--Congresses.
Princeton subject headings:
Insects--Migration--Congresses.
Insects--Southern States--Migration--Congresses.
Lepidoptera--Southern States--Congresses.