Columbia subject headings:
Sewage irrigation--Health aspects.
Sewage--Analysis--Laboratory manuals.
Sewage--Microbiology--Laboratory manuals.
Harvard subject headings:
Medical microbiology--Laboratory manuals.
Medical parasitology--Laboratory manuals.
Sewage--Analysis--Laboratory manuals.
Princeton subject headings:
Medical microbiology--Laboratory manuals.
Medical parasitology--Laboratory manuals.
Sewage--Analysis--Laboratory manuals.