daftar pustaka tanah
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Daftar Pustakahttp://science-cermin.blogspot.com/2011/03/i.htmlhttp://id.wikipedia.org/wiki/Tanahhttp://balittanah.litbang.deptan.go.id/dokumentasi/buku/tanahsawah/tanahsawah2.pdfhttp://sobatbaru.blogspot.com/2010/05/tanah-sulfat-masam.htmlhttp://repository.usu.ac.id/bitstream/123456789/21653/4/Chapter%20II.pdfhttp://www.bisnis.com/articles/lahan-tanah-sulfat-masam-kurang-dioptimalkanhttp://dasar2ilmutanah.blogspot.com.