Hovey's Handbook of the Mammoth Cave of Kentucky A Practical Guide to the Regulation Routes

Horace Carver Hovey

《Hovey's Handbook of the Mammoth Cave of Kentucky A Practical Guide to the Regulation Routes》，Horace Carver Hovey。这是一部关于历史、科学、艺术的公版作品，适合在安静的片刻里慢慢读下去。