Columbia subject headings:
Harvard subject headings:
Insect hormones--Congresses.
Insects--Physiology--Congresses
Light--Physiological effect--Congresses
Mollusks--Physiology--Congresses.
Photoperiodism--Congresses.
Princeton subject headings:
Insects--Physiology--Congresses.
Mollusks--Physiology--Congresses.
Photoperiodism--Congresses.