This series was originally printed circa 75 separate books which were combined and rebound by EFEO, of which 38 [from HN 0512 to HN 0531, and HN 0619 to HN 0636] are found in the ISSI HN Hán Nôm collection. This digital series contains 32 of these books, except for HN 0512, HN 0513, HN 0514, HN 0515, HN 0516 and HN 0530.