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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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

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.