Liste des observatoires magnétiques et des observatoires séismologiques /
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| Format: | Book |
| Language: | French |
| Published: |
Bruxelles :
Hayez,
1910.
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| Item Description: | At head of title: Observatoire royal de Belgique. Service astronomique. |
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| Physical Description: | x, 192 p. ; 25 cm. |
| Bibliography: | Includes bibliographies. |