PUBLIC WORKS IN NEW YORK CITY. THE NATIONAL ACADEMY OF SCIENCES. THE DATE OF THE GLACIAL ERA IN EASTERN NORTH AMERICA. PHOTOPHONIC AND SPECTROPHONIC DISCOVERIES., scientific american, 1881-05-07
PUBLIC WORKS IN NEW YORK CITY. THE NATIONAL ACADEMY OF SCIENCES. THE DATE OF THE GLACIAL ERA IN EASTERN NORTH AMERICA. PHOTOPHONIC AND SPECTROPHONIC DISCOVERIES., scientific american, 1881-05-07
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