Columbia subject headings:
Harvard subject headings:
Fleas as carriers of disease--History--Congresses.
Fleas--Control--History--Congresses.
Hemiptera--Control--History--Congresses.
Insects as carriers of disease--History--Congresses.
Lice as carriers of disease--History--Congresses.
Lice--Control--History--Congresses.
Parasitology--History--Congresses.
Princeton subject headings:
Fleas as carriers of disease--History--Congresses.
Fleas--Control--History--Congresses.
Hemiptera--Control--History--Congresses.
Insects as carriers of disease--History--Congresses.
Lice as carriers of disease--History--Congresses.
Lice--Control--History--Congresses.
Parasitology--History--Congresses.