Persistent URL of this record https://hdl.handle.net/1887/6204
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- Article / Letter to editor
- open access
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Report of the Director of the Observatory at Leiden for the period from May 1 1919 to August 31 1921
- All authors
- Sitter, W. de
- Date
- 1921
- Volume
- 1
- Pages
- 5 - 12
- Publisher
- North Holland Publishing Company