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The Toltecs and Maya developed wheels for religious reasons but not for wheelbarrows or other practical uses The reason is that they had sufficient slave labor

The Greek citystates were democratic by our modern American definition

予防療法 - 日本頭痛学会

熱溶着（ヒートシール）の加熱方法の最適化 菱 沼 一 夫

Energy Costs of Exercise and Sport

第2章 デンマークの農業戦略と 新共通農業政策（CAP）の

The Young Athlete

Bostonia1971v45n3_web - OpenBU

詳細リスク評価テクニカルガイダンス 詳細版（その4）

草の根・人間の安全保障無償資金協力
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