There has been data ("Happu-Bulang Costum Adat: Suku Batak Angkola, Sipirok, Padang Bolak, Barumun, Sosa, Mandailing, Batang Natal, Natal: Pelajaran Adat Tapanuli Sel") available for this ISBN from the data sources that books-by-isbn.com uses, but not on the latest request on Tue Jan 7 22:05:23 2020, so the data displayed here has been removed .