THE MONT BLANC OBSERVATORY. Fig. I. FRAMEWORK OF THE JANSSEN OBSERVATORY MOUNTED UPON THE SNOW AT THE SUMMIT OF hIONT BLANC. Fig. 2THE OBSERVATORY BURIED IN THE SNOW. ELECTRIC PROPULSION OF CANAL BOATS. TRIAL OF ELECTRIC TROLLEY SYSTEM ON THE ERIE CANAL., scientific american, 1893-12-09
THE MONT BLANC OBSERVATORY. Fig. I. FRAMEWORK OF THE JANSSEN OBSERVATORY MOUNTED UPON THE SNOW AT THE SUMMIT OF hIONT BLANC. Fig. 2THE OBSERVATORY BURIED IN THE SNOW. ELECTRIC PROPULSION OF CANAL BOATS. TRIAL OF ELECTRIC TROLLEY SYSTEM ON THE ERIE CANAL., scientific american, 1893-12-09
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