Svenonius, Bjorn.
Contributions to the photographic study of colour, resolution and total magnitude of anagalactic objects : with special regard to objects photographed at Helwan / Bjorn Svenonius. - Lund : Observatory, c1938. - 160 p.: ill. ; 30 cm. - Annals of the observatory of Lund; no. 7. .
Observatories.
522.1 / SVC
Contributions to the photographic study of colour, resolution and total magnitude of anagalactic objects : with special regard to objects photographed at Helwan / Bjorn Svenonius. - Lund : Observatory, c1938. - 160 p.: ill. ; 30 cm. - Annals of the observatory of Lund; no. 7. .
Observatories.
522.1 / SVC