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qld.gov.au
Queensland Department of Environment and Heritage Protection. "Soil pH". www.qld.gov.au (بالإنجليزية الأسترالية). Archived from the original on 2016-05-07. Retrieved 2017-05-15.
web.archive.org
Queensland Department of Environment and Heritage Protection. "Soil pH". www.qld.gov.au (بالإنجليزية الأسترالية). Archived from the original on 2016-05-07. Retrieved 2017-05-15.