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Determination and discussion of the spectral classes of 700 stars, mostly near the north pole .

Proefschrift--Groningen. / "Stellingen" ([3] p. ) laid in.

Identiferoai:union.ndltd.org:OCLC/oai:xtcat.oclc.org:OCLCNo/463827030
Date January 1920
CreatorsBruggen Cate, Gerrit Hendrik ten.
PublisherGroningen, Gebroeders Hoïtsema,
Source SetsOCLC
LanguageEnglish
Detected LanguageEnglish

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