The Encyclopedia Americana (1920)/A B C Process
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A B C PROCESS: a name given to a method of purifying sewage by sulphate of alumina, blood, charcoal, and clay.
Edition of 1920. See also ABC process (purification) on Wikipedia, and the disclaimer.
A B C PROCESS: a name given to a method of purifying sewage by sulphate of alumina, blood, charcoal, and clay.