Available under Creative Commons-ShareAlike 4.0 International License.
Below are the resources referred to or cited by the developer(s) of the original unit:
Chiras, C C (1994) Environmental Science — Action for a Sustainable Future, Redwood City, CA: Benjamin/Cummings.
Henry, J G and Heinke, GW (1996) Environmental Science and Engineering, 2nd edn, Upper Saddle River, NJ: Prentice-Hall.
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