Hannyaji iseki (Nishi yashiki chinai), Ryūōji kofun, Hannyaji iseki (Shishizuka Shōgakko nai) hakkutsu chōsa gaihō
By: [henshū Tsuchiura-shi Iseki Chōsakai]
Publisher: Tsuchiura-shi Kyōiku Iinkai
Published: 1987
Place of publication: Ibaraki-ken Tsuchiura-shi
Language: jpn
Number of pages: 29