Ōita-ken (Japan)

• "Yutaka no kuni kouri kakaku jōhō nettowāku" chōsa hōkokusho
• 21-seiki no "Hō no Kuni no kawazukuri" o mezashite
• Dai 2-ji Ōita-ken gomi shori kōikika keikaku
• Dai 2-ji Ōita-ken haikibutsu shori keikaku
• Gyōkōkeishi
• Hita Kusu kenʼiki kōji toshi kinō seibi keikaku
• Ōita chūbu chiiki shinrin keikakusho
• Ōita kensei seron chōsa
• Ōita-ken ni okeru kaiiki sōgō riyō gijutsu kadai ni kansuru chōsa hōkokusho
• Ōita-ken shōgai fukushi keikaku
• Toyokuni shōshi