Columbia subject headings:
Copper compounds--Congresses.
Molluscicides--Congresses.
Schistosomiasis--Prevention--Congresses.
Harvard subject headings:
Copper compounds--Congresses.
Molluscicides--Congresses.
Schistosomiasis--Prevention--Congresses.
Princeton subject headings:
Copper compounds--Congresses.
Molluscicides--Congresses.
Schistosomiasis--Prevention--Congresses.