This set of books were printed by the scholars of Jiphyeonjeon (Academy of Worthies; a royal research institute established by King Sejong) such as Sin Sukju, Seong Sammun and Yi Gae at the behest of the king in the 30th year of King Sejong, Joseon Kingdom (1448). Larger letters of the main text were printed with wood blocks, while smaller ones were printed with Gapinja (third generation font of the first metal type font, Gyemija), and the preface with larger Gapinja. The set consists of 6 volumes, each measuring 19.8 cm wide and 31.9 cm long. Apart from 7 pages of preface and 4 pages of table of contents, the first volume has 46 pages; the second, 47 pages; the third, 46 pages; the fourth, 40 pages; the fifth, 43 pages; and the sixth has 44 pages respectively.

This complete set is different in some points from the other Donggukjeonun (National Treasure #71) which was printed simultaneously; its sides of the pages the sky and the earth were sliced off slightly in bookbinding; it has subtitles for each volume, Ye, Ak, Sa, Eo, Seo, and Su which presumably were added later; finally both have same titles printed with wood blocks, however carved in different handwritings.

This set of book, along with Donggukjeonun, (National Treasure #71), holds enormous value for phonologic study.

This document was written by Yiyi's brothers and sisters while they were discussing about the inheritance of their dead parents. According to what it is written,it tells about the disrtibution of lands and slaves used for parents' tombs and various rituals, then it records the specific distribution of the remaining inheritance to each members of the family including late father's concubine Kwon. Finally, at the end of the document, it indicates the names of the participants and their signatures.

This document not only shows some of the details of Yiyi's private history but it also serves as an excellent example of how the succession of the inheritance was carried on in Chosun period.

This is a mountain fortress located around the Mt. Achasan (285meters high above the sea level), Kwangjin-gu, Seoul, and was built of stone during the age of Three Kingdoms. The total length of this castle is 1,125m and the height is about 10m. There remains the traces of gates and waterways on the east, the west, and the south, and also remains the curved walls which had the role to protect the inner one by covering the front of gate. Besides many pieces of eartherwares and broken rooftiles were found in the various building sites.

It is heared that this Acha castle has 2 sad histories. One is that the King Gyero of Baekje Kingdom was killed under the fortress when Hansan, the capital city of Baekje, was occupied by the Goguryeo force, and the other is that in this fortress compound there is the Ondal Fountain which has kept a historical tradition saying the General Ondal, the son-in-law of King

pyeongwon of Goguryeo Kingdom died under the fortress in the battle with the Silla force to recover the lost area over Jukryeong. In 1997, the fortress of Acha mountain was dug out by the excavating team from the Museum of Seoul National University, and it was confirmed that it is the historic site of Goguryeo Kingdom, not that of Baekje Kingdom after many heritages including more than 100 pieces of earthenware, more then 30 pieces of steel products, and more than 100 pieces of arms were found. It is foreseen that this work will contribute greatly to the study of the culture of Goguryeo Kingdom around this region though the detailed and further investigation and excavation are required. The Acha mountain fortress has the significance as a historical site where the 3 kingdoms had struggled to occupy the valley along the Hangang River though still remains the debate as to by which Kingdom it was built.