Buku Stasiun Nol Edisi 2 | Teknik Pemetaan dan Survey Hidrologi Gua 4 October, 2016 by ASC-Jogja · Published 4 October, 2016 · Last modified 21 December, 2024
SRI GETHUK WATERFALL (The River Mapping) 26 July, 2012 by ASC-Jogja · Published 26 July, 2012 · Last modified 21 December, 2024
Speleological Thematic Class 3 February, 2016 by ASC-Jogja · Published 3 February, 2016 · Last modified 21 December, 2024