PlanetenbuchIn: Programm des Gymnasium Ernestinum zu GothaYear 1872S. 4 - 5Hg. von Karl RegelOnline editions:books.google.com/books?id=649SAAAAcAAJ&pg=PA4www.digitale-sammlungen.de/de/view/bsb11001021?page=6hdl.handle.net/2027/uiug.30112067742905?urlappend=%3Bseq=12books.google.com/books?id=Fl9CAQAAMAAJ&pg=PA4books.google.com/books?id=FAVQAAAAcAAJ&pg=PA4LanguagegermanUniform titlePlanetenbuchParallel titleGroßes PlanetenbuchReferencesopen
