JB-AK_Hist-1999.pdf https://astronomische-gesellschaft.de/de/aktivitaeten/publ/jb/inst/ak-hist/JB-AK_Hist-1999.pdf/view https://astronomische-gesellschaft.de/logo.png JB-AK_Hist-1999.pdf JB-AK_Hist-1999.pdf — 122.5 KB