9989.横須賀海軍鎮守府鳥ヶ崎洞窟砲台(かもめ団地の砲弾試験用着弾場) (Yokosuka Navy Department of Guardian Torigasaki Cave Battery (Impact Field for Cannonball Tests at Seagull Complex))
9990.三戸海岸南洞窟陣地(三戸浜南洞窟陣地) (Mito coast South cave location (Mito Hamanami cave location))
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