Maha banya baramilda Simgyeong in-gyo sangui jikhae (Direct Interpretation of the Detailed Meaning of Guiding and Teaching the Heart Sutra of the Great Perfection of Wisdom)

This book is an unknown author’s commentary on the Heart Sutra of the Perfection of Wisdom translated by Xuanzang (玄奘, 602~664) of Tang dynasty. This commentary is not part of the Great Collection of Buddhist Scriptures but the only edition of its kind. It is stored at Cheongju Early Printing Museum.