Asztrofizikai Obszervatórium (Herény)(54)
Barnard, Edward Emerson (1857-1923)(50)
Central-Magazin für Photographen-Bedarf Ernst Herbst & Firl (1893-1899)(48)
University of Oxford. Observatory(38)
Hertzsprung, Ejnar (1873-1967)(32)
Holden, Edward S. (1846-1914)(32)
Astrophysikalisches Observatorium zu Potsdam (1874-1969)(31)
Dr. C.Schleussner AG (Frankfurt, Main) (1860-)(29)