These are completed and decribed by Ubaghs in the mentioned Kutai area, and are also finished in his 5 maps of scale 1:25.000 it included not only the region west and east koetai (exduded apart of S.W. And N.W Koetai) but also Balikpapan, The whole Mangkaliat peninsula and a small part of upper Mahakam. in comexion with Dr. Zwierzycki's criticism et is necessary to revise or to corred the above mentioned chapters.
Ketersediaan
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Pusat Sumber Daya Mineral, Batubara dan Panas Bumi - Jln. Soekarno Hatta No. 444, Bandung, Jawa Barat
PMB LF 1942 - 1