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≠ Leeuwen, F.W.B. van
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Hertzsprung, E.
1921
Stars possibly belonging to the group of the Hyades, selected from a comparison between A. G. Berlin A and A. G. Berlin B with Abbadia 1915
Article / Letter to editor
open access
Hins, C.H.
1921
On a method of Prof. Kapteyn for the determination of the collimation error of a meridian instrument applicable in different zenith distances (Errata: 1 19)
Article / Letter to editor
open access
Sitter, W. de
1921
Report of the Director of the Observatory at Leiden for the period from May 1 1919 to August 31 1921
Article / Letter to editor
open access
