Magma Evolution of Ngebel Volcano, Ponorogo, East Java, Indonesia von Yudiantoro, Dwi Fitri, Ratnaningsih, Dyah Rini, Pratiknyo, Puji, Mahreni, Mahreni, Sayudi, Dewi Sri, Haty, Intan Paramita, Hamdalah, Hafiz, Abdurrachman, Mirzam, Takashima, Isao, Ismunandar, Wisnu, Muhammad, Richzkey, Sampurno, Demi Ganjar

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