ISLAMIC EDUCATION DURING LANGKAT SULTANATE ERA IN 1912-1946: A Historical Study of Jam’iyah Mahmudiyah li Thalibil Khairiyah Langkat - Dahlan, Zaini; STAI Syekh H. Abdul Halim Hasan Al-Ishlahiyah Binjai (State Islamic University North Sumatra, 2017)