Columbia subject headings:
Organic compounds--Environmental aspects.
Water chemistry.
Harvard subject headings:
Organic compounds--Environmental aspects--Case studies.
Organic compounds--Environmental aspects--Problems, exercises, etc.
Water chemistry--Case studies.
Water chemistry--Problems, exercises, etc.
Princeton subject headings:
Organic compounds--Environmental aspects--Problems, exercises, etc.
Organic compounds--Environmental aspects.
Water chemistry--Problems, exercises, etc.
Water chemistry.