Sinpyeon sanhak gyemong (Introduction to Computational Studies, New Edition)

This book on computational studies was first compiled by Zhu Shijie (13-14th c.) of Yuan dynasty and later printed using gyeongo font cast in 1450. This book contains question-and-answer explanations of various units of weights and measures used at the time such as various types of paddy and dry fields as well as methods of calculating their area, units of measure for grain and crops, and conversion methods between different units.