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Hydra Hydra (truyện tranh) Hydra (vệ tinh) Hydralazine Hydrazin Hydrat Hydrastin Hydra vulgaris Hydrangea arborescens Hydra 70Tài liệu tham khảo
WikiPedia: Hydra http://cartelen.louvre.fr/cartelen/visite?srv=car_... https://archive.org/details/greekmyths0002unse https://archive.org/details/greekreligion0000burk https://archive.org/details/prolegomenatost02harrg... https://commons.wikimedia.org/wiki/Category:Lernae...