Tsuchiura-shi Iseki Chōsakai

• Hannyaji iseki (Nishi yashiki chinai), Ryūōji kofun, Hannyaji iseki (Shishizuka Shōgakko nai) hakkutsu chōsa gaihō
• Kamitakatsu kaizuka hakkutsu chōsa hōkokusho
• Tsuchiura-shi Takakubo Ichirizuka hakkutsu chōsa hōkokusho