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clgr:Ingrid_van_Houten-Groeneveld
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clgr:Leiden_Observatory
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clgr:Leiden_Observatory
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Leiden Observatory
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Leiden Observatory
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Photographic Refractor Leiden Observatory Leiden Obs. Sterrewacht te Leiden observatory Leiden observatories Leiden University Observatory Leiden Astronomical Observatory Sterrewacht Leiden Leiden
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clgr:Frank_Pieter_Israel
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clgr:Leiden_Observatory
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clgr:Cornelis_Johannes_van_Houten
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clgr:Maarten_Schmidt
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