Determination and discussion of the spectral classes of 700 stars, mostly near the north pole ...
By: door Gerrit Hendrik ten Bruggen Cate ...
Publisher: Gebroeders Hoïtsema
Published: 1920
Place of publication: Groningen
Language: eng
Number of pages: 44
Subjects: Stars -- Spectra
Notes: Proefschrift--Groningen.

"Stellingen" ([3] p.) laid in.