Matches in Library of Congress for { ?s ?p Astronomical observatories History.. }
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- 03012898%2F%2Fr90 subject "Astronomical observatories History.".
- 2010327308 subject "Astronomical observatories History.".
- 72187666%2F%2Fr933 subject "Astronomical observatories History.".
- 73175209%2F%2Fr94 subject "Astronomical observatories History.".
- 80002144%2F%2Fr932 subject "Astronomical observatories History.".
- 86021542 subject "Astronomical observatories History.".