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Ronaldo, Aji, Ministry of Transportation Republic of Indonesia (Indonesia)
Ronggosusanto, Teguh Himawan, Ministry of Transportation (Indonesia)
Rosalina, Harnita, Gadjah Mada University (Indonesia)
Rostiyanti, Susy F, Department of Construction Engineering and Management, Universitas Agung Podomoro, Jakarta, INDONESIA & Bidang Literatur IQSI, Ikatan Quantity Surveyor Indonesia, Jakarta, INDONESIA (Indonesia)
Rusgiyanto, Rusgiyanto, Zamil Engineering Consultant Company, Yogyakarta, INDONESIA (Indonesia)
Ruzziyatno, Ruhban, Directorate General of Water Resources, Ministry of Public Works (Indonesia)
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