Title |
On a disquieting earth, 500 years after Copernicus : papers presented at the "Copernicus Celebration" in Ottawa, the 28th of November 1973 = Sur une terre incertaine, 500 ans après Copernicus : communications de la "Célébration Copernic" présentée à Ottawa, le 28 novembre 1973 / [cover, graphics and ill. were prepared by Zygmunt J. Nowak] |
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