1.

雑誌
雑誌
1. Bulletin
Academy of Scientific Research and Technology Helwan Institut of Astronomy and Geophysics
出版情報: [s.l.] : Academy of Scientific Research and Technology Helwan Institut of Astronomy and Geophysics, Helwan Observatory
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2.

雑誌
雑誌
2. Bulletin
Khedivial Observatory, Helwan
出版情報: Cairo : Survey Department, Egypt, 1911-
巻次（年次）: Vol. 1, no. 1 (Sept. 1911)-
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