Description des installations du service de l'heure /
Sábháilte in:
| Údar corparáideach: | |
|---|---|
| Rannpháirtithe: | , |
| Formáid: | LEABHAR |
| Teanga: | French |
| Foilsithe / Cruthaithe: |
Bruxelles :
Hayez, imprimeur,
1912.
|
| Ábhair: |
| Cur síos ar an mír: | At head of title: Observatoire royal de Belgique. Service astronomique. |
|---|---|
| Cur síos fisiciúil: | 73 p. : illus., III fold. pl., diag. ; 25 cm. |