Contributions to the photographic study of colour, resolution and total magnitude of anagalactic objects with special regard to objects photographed at Helwan
"Contributions to the photographic study of colour, resolution and total magnitude of anagalactic objects with special regard to objects photographed at Helwan"
"Contributions to the photographic study of colour, resolution and total magnitude of anagalactic objects : With special regard to objects photographed at Helwan"@sv
"Contributions to the photographic study of colour, resolution and total magnitude of anagalactic objects, with special regard to objects photographed at Helwan [academical dissertation], by Björn Svenonius"
"Contributions to the photographic study of colour, resolution and total magnitude of anagalactic objects"
"Contributions to the photographic study of colour, resolution and total magnitude of anagalactic objects photographed at Helwan"
"Contributions to the photographic study of colour, resolution and total magnitude of anagalactic objects : with special regard to objects photographed at Helwan"
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