Publications of the Astronomical laboratory at Groningen.

Ceased with no. 61. Superceded by the Bulletin of the Astronomical Institutes of the Netherlands, Supplement series.Nos. 4 and 6 never issued.Nos. 1-31 edited by J. C. Kapteyn, director; no. 32- , P. J. van Rhijn, director.No. 8 has cover-title only.Nos. 2-3, and 15-16 issued together, also no. 50-51.Title varies: no. 32- , Publications of the Kapteyn astronomical laboratory at Groningen.Mode of access: Internet