Other
Nova Scotia Environment: Iron Bacteria and Sulphur Bacteria [Pdf]
Information page on iron bacteria and sulfur bacteria, both of which can affect the quality of drinking water from a well. Includes guidance on how to recognize their presence, what to do if there is a problem, and how to maintain water...
University of Illinois
University of Illinois: Purple Bacteria
Advanced material that provides information on the purple and green sulfur bacteria and the chemical processes they use to live.
Other
Indiana Biolab: Sulfur Bacteria
Information on the sulfur bacteria and the effects they have on sulfur itself.