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== Rujukan ==
* D. K. Nordstrom, C. N. Alpers, C. J. Ptacek, D. W. Blowes (2000). Negative pH and Extremely Acidic Mine Waters from Iron Mountain, California. ''Environmental Science & Technology'' '''34''' (2), 254-258. (Available online: [http://dx.doi.org/10.1021/es990646v DOI] | [http://pubs.acs.org/cgi-bin/abstract.cgi/esthag/2000/34/i02/abs/es990646v.html Abstrak] | [http://pubs.acs.org/cgi-bin/article.cgi/esthag/2000/34/i02/html/es990646v.html Teks penuh (HTML)] | [http://pubs.acs.org/cgi-bin/article.cgi/esthag/2000/34/i02/pdf/es990646v.pdf Teks penuh (PDF)])
* [http://www.aqion.onl Online pH Calculator]
 
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