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Lubang, Occidental Mindoro Lubang hidung Lubang Buaya Lubang biru Lubang benam Lubang Neraka Lubang cecacing Lubangbuaya Lubango Lubang gelapRujukan
WikiPedia: Lubang benam //doi.org/10.1130%2F0091-7613(1995)023%3C0949:GOAS... http://www.bgs.ac.uk/mendips/caveskarst/karst_3.ht... https://ui.adsabs.harvard.edu/abs/1995Geo....23..9... https://www.independent.co.uk/news/science/sinkhol...