Helmut Ullrich Astronomical Observatory (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Helmut Ullrich Astronomical Observatory" in English language version.

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Global rank English rank

2web.archive.org

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2cortinastelle.it

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cortinastelle.it

cortinastelle.it

"L'OSSERVATORIO ASTRONOMICO DEL COL DRUSCIE' "HELMUT ULLRICH"" (in Italian). L’Associazione Astronomica Cortina. Archived from the original on 3 February 2019. Retrieved 23 November 2012.

astroweb.cortinastelle.it

"Associazione Astronomica Cortina". Col Drusciè observatory Helmet Ulrich. AstroWeb System. Archived from the original on 23 March 2010. Retrieved 23 November 2012.

web.archive.org

"L'OSSERVATORIO ASTRONOMICO DEL COL DRUSCIE' "HELMUT ULLRICH"" (in Italian). L’Associazione Astronomica Cortina. Archived from the original on 3 February 2019. Retrieved 23 November 2012.
"Associazione Astronomica Cortina". Col Drusciè observatory Helmet Ulrich. AstroWeb System. Archived from the original on 23 March 2010. Retrieved 23 November 2012.