Nurrahman Fajri, author
Studi populasi pohon ulmus lanceifolia roxb. ex wall di hutan desa adat Lau Buluh Kecamatan Kutabuluh Kabupaten Karo, Sumatra Utara = Population study of pengkih ulmus lanceifolia roxb. ex wall tree in indigenous village forest of Lau Buluh District Kutabuluh Karo Regency, North Sumatra
2019
 UI - Skripsi (Membership)
Anderson, John, author
Acheen and the ports on the north and east coasts of Sumatra
Kuala Lumpur Oxford University Press 1971
 Buku Teks
Reid, Anthony, 1939-, author
The contest for North Sumatra : Atjeh, the Netherlands, and Britain, 1858-1898
Oxford University Press, 1969
 Buku Teks
Mineralogica and chemical characteristics of spodosols in Toba highland, north Sumatra
 Artikel Jurnal
Bangun, Pajung
Sources of power of the political parties in North Sumatra / Pajung Bangun
International Association of Historians of Asia (IAHA), 1974
 Buku Teks
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