✦ LIBER ✦

CHRONOLOGY January 1, 1955 — March 31, 1955

No coin nor oath required. For personal study only.

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Provisional sunspot-numbers for January

✍ Waldmeier, M. 📂 Article 📅 1955 🏛 American Geophysical Union 🌐 English ⚖ 44 KB