Columbia subject headings:
Bacteria.
Leeuwenhoek, Antoni van, 1632-1723--Bibliography.
Leeuwenhoek, Antoni van, 1632-1723.
Protozoa.
Harvard subject headings:
Bacteria
Biologists--Netherlands--Biography.
Leeuwenhoek, Antoni van, 1632-1723.
Protozoa.
Princeton subject headings:
Bacteria.
Leeuwenhoek, Antoni van, 1632-1723.
Protozoa.