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Mondai to kenkyū
Toshi-mondai kenkyū
Rōjin hoken shisetsu jittai chōsa, rōjin hoken shisetsu hōkoku
Rōjin hoken shisetsu chōsa, rōjin hoken shisetsu hōkoku
Rōjin hoken jigyō hōkoku
Rōjin hoken shisetsu chōsa
Chūgoku mondai
Kokusai mondai
K?osanken mondai
Gunshuku mondai shiryō