70 Jahre Observatorium Hoher List - Sieben Jahrzehnte astronomische Beobachtung in der Eifel.
70 Years Observatory Hoher List - Seven Decades of Astronomical Observations in the Eifel. Nuncius Hamburgensis; Band 37.
70 Years Observatory Hoher List - Seven Decades of Astronomical Observations in the Eifel. Nuncius Hamburgensis; Band 37.