Dark clouds in Kapteyn's special areas 2, 5, 9 and 24 and the proper motion of stars in these regions
Contributors: Rijksuniversiteit te Groningen
Publisher: Hoitsema
Published: 1938
Place of publication: Groningen
Language: eng
Number of pages: 74
Notes: Thesis (doctoral)--Rijksuniversiteit te Groningen, 1938.