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CHAPTER I. SEEKING A CLUE
CHAPTER II. A REMARKABLE LETTER. CHAPTER III. A WORKSHOP IN THE WOODS. CHAPTER IV. THE BIPLANE IN ACTION. CHAPTER V. BY AERIAL EXPRESS. CHAPTER VI. RECONNOITERING. CHAPTER VII. AN UNWELCOME VISITOR. CHAPTER VIII. THE PROFESSOR LEADS THE WAY. CHAPTER IX. MEETING AN OLD FRIEND. CHAPTER X. AUNTY HEP TAKES A RIDE. CHAPTER XI. THE CAMPERS. CHAPTER XII. BROTHER DICK. CHAPTER XIII. DISCOVERY IMPENDS. CHAPTER XIV. A NATURAL PRISON. |