Geokimia
1984 Index of Northern Sumatra Geological and Geochemical Maps, and Nothern Sumatra Bibliography
This section is list of currently available published geological and geochemical maps for Sumatera North of the equator. further information abput these maps is given in the geosurvey newsletter (berita geologi, Direktorat Jenderal Pertambangan Umum)
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