《蒙古源流》,蒙古文,清代竹笔手写本,梵夹装。开本高10.6厘米、宽35厘米,共122页,每页19行,每行8个字。此书系内蒙古社会科学院图书馆莫日根巴特尔先生于1954年在原伊克昭盟鄂托克旗阿拉格苏勒德祭祀地走访时收集到的。此本是世间三十余种版本中最古老 “Origin of Mongolia”, Mongolian, bamboo handwritten scriptures in the Qing Dynasty, Brahma folder. Opening height 10.6 cm, width 35 cm, a total of 122 pages, 19 pages per page, each line of 8 words. This book was collected by Mr. Muganat Batter, a member of the Inner Mongolia Academy of Social Sciences Library, during his visit to the Arague Suraud Sacrificial Site in the former Ik Zuomeng Etuoke Banner in 1954. This book is the oldest in more than thirty versions of the world