Sekiyu senbai ni kansuru kenkyuu

Parupu senbai ni kansuru kenkyuu

Parupu senbai ni kansuru kenkyuu

Seishu senbai ni kansuru kenkyuu

Seishu senbai ni kansuru kenkyuu

Sekiyu sekitan gasu ni kansuru kenkyuu

Senbai enka ni kansuru chousa

Sekiyu kasai bougyo ni taisuru kenkyuu

Sekiyu gasu choryuu tansanenganchuu no muki biryou seibun ni kansuru kenkyuu

Furō nettowāku ni kansuru kenkyuu

Sakusan ni kansuru kenkyuu

Fukushuu ni kansuru kenkyuu

Taiiku ni kansuru kenkyuu

Shounou ni kansuru kenkyuu

Shounou ni kansuru kenkyuu

Sakusan ni kansuru kenkyuu

Sekiyu seisei puranto no kenzensei hyouka to zairyou rekka ni kansuru kenkyuu

Senji sekiyu zousan ni kansuru kenpakusho

Maruchisutēji intakonekushon nettowāku ni kansuru kenkyuu

Kosakuken ni kansuru kenkyuu

Moukyouiku ni kansuru kenkyuu

Moukyouiku ni kansuru kenkyuu

Moukyouiku ni kansuru kenkyuu

Ōesukībyouuirusu ni kansuru kenkyuu

Kyouanrei ni kansuru kenkyuu