✦ LIBER ✦

Provisional sun-spot numbers for 1920

✍ Scribed by Wolfer, A.

No coin nor oath required. For personal study only.

📜 SIMILAR VOLUMES

Wolfer provisional sun-spot numbers for

✍ van Dijk, G. 📂 Article 📅 1920 🏛 American Geophysical Union 🌐 English ⚖ 37 KB

Provisional sun-spot numbers for 1921

✍ Wolfer, A. 📂 Article 📅 1921 🏛 American Geophysical Union 🌐 English ⚖ 29 KB

Provisional sun-spot numbers for January

✍ Wolfer, A. 📂 Article 📅 1922 🏛 American Geophysical Union 🌐 English ⚖ 18 KB

Provisional sun-spot numbers for July to

✍ Wolfer, A. 📂 Article 📅 1922 🏛 American Geophysical Union 🌐 English ⚖ 30 KB

Provisional sun-spot numbers for April t

✍ Wolfer, A. 📂 Article 📅 1923 🏛 American Geophysical Union 🌐 English ⚖ 31 KB

Provisional sun-spot numbers for July to

✍ Wolfer, A. 📂 Article 📅 1923 🏛 American Geophysical Union 🌐 English ⚖ 20 KB