Study of geotourism development in Batumilmil Karst, Langkat, Sumatera Utara by Haryono, E., Reinhart, H., Rabbani, D.I., Putra, R.D., Sukarno, B., Sasongko, M.H.D., Afid, N., Hakim, L., Ristiawan, A.W., Susanto, A.D., Fauzan, M., Saputra, A.

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