Visual observations of artificial earth satellites in Finland

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245 0 0 ‡aVisual observations of artificial earth satellites in Finland.
260 ⊔ ⊔ ‡aHelsinki, ‡bIlmatieteen laitos.
300 ⊔ ⊔ ‡av. ‡c31 cm.
538 ⊔ ⊔ ‡aMode of access: Internet.
550 0 ⊔ ‡aVols. for -1972 published by the University of Helsinki, Meteorological Observatory.
650 ⊔ 0 ‡aArtificial satellites ‡xTracking ‡xPeriodicals.
710 1 ⊔ ‡aTähtitieteellinen observatorio (Helsinki, Finland)
710 2 ⊔ ‡aIlmatieteen laitos (Finland)
CID ⊔ ⊔ ‡a009631944
DAT 0 ⊔ ‡a20100215091047.0 ‡b20110315000000.0
DAT 1 ⊔ ‡a20120814073806.0 ‡b2024-07-20T17:32:53Z
DAT 2 ⊔ ‡a2024-07-20T17:30:02Z
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