• 4 Memorial Library

• 4 Journals, Magazines, Newspapers

• 2 Batak (Indonesian people)
• 1 Batak language
• 1 Economic conditions
• 1 Indonesian philology
• 1 Social conditions

• 1 Indonesia. Direktorat Bahasa dan Kesusastraan
• 1 Yayasan Seni Budaya Batak Maduma (Indonesia)

• 1 Multiple languages

• 1 Indonesia
• 1 Sumatera Utara (Indonesia)

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