MENTS AT THE BLUE HILL OBSERVATORY. THE BLUE BILL OBSERVATORY—BEGINNING OF AN ASCENT. BIRD'S EYE VIEW OF BLUE HILL OBSERVATORY TAKEN FROM A KITE BY W. A. EDDY. BLUE HILL OBSERVATORY—STEAM POWER WINDLASS FOR KITES., scientific american, 1899-02-25
MENTS AT THE BLUE HILL OBSERVATORY. THE BLUE BILL OBSERVATORY—BEGINNING OF AN ASCENT. BIRD'S EYE VIEW OF BLUE HILL OBSERVATORY TAKEN FROM A KITE BY W. A. EDDY. BLUE HILL OBSERVATORY—STEAM POWER WINDLASS FOR KITES., scientific american, 1899-02-25
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