Talk:John Charles Duncan

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Astronomy Low‑importance

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[Starting point]

This initial entry is a translation from the German Wikipedia.Cmholm (talk) 21:13, 16 September 2019 (UTC)[reply]

Copyright status of text books

While archive dot org is on solid ground hosting older editions of "Astronomy", his daughter renewed the copyright on the 4th edition in 1974, and "Essentials of Astronomy" in 1968. They should come off copyright in 2041 and 2037 respectively. Cmholm (talk) 18:55, 27 January 2025 (UTC)[reply]