Short history of the Observatory of the University at Leiden 1633-1933 / by W. de Sitter
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Short history of the Observatory of the University at Leiden 1633-1933 / by W. de Sitter
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Omslagtitel: Leiden Observatory 1633-1933
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Short history of the Observatory of the University at Leiden 1633-1933
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Short history of the Observatory of the University at Leiden 1633-1933 / by W. de Sitter