Columbia subject headings:
Medical geography--Sudan--Periodicals.
Mosquitoes--Periodicals.
Tropical medicine--Periodicals.
Harvard subject headings:
Medical geography--Sudan.
Mosquitoes.
Tropical medicine--Periodicals
Tropical medicine.
Princeton subject headings:
Medical geography--Sudan--Periodicals.
Mosquitoes--Periodicals.
Periodicals.
Tropical medicine--Periodicals.