Preliminary statistics of nebulae and clusters.
Series: Meddelande fr©®an Lunds astronomiska observatorium, no. 56. Arkiv f©·or matematik, astronomi och fysik, bd. 9, no; Arkiv f©·or matematik, astronomi och fysik, bd. 9 -- no.
Publisher: Almquist & Wicksells
Published: 1913
Place of publication: Uppsala
Subjects: Astronomy -- Table; Nebul