Possible ideas for additions to library

Last time I checked, those materials were all still under copyright. They are probably getting close to falling into the public domain though and I have them on my list.
 
I'm not too sure Walvoord's writings would be public domain any time soon.

Excerpt from https://walvoord.com/:
His first book, published in 1943, was The Doctrine of the Holy Spirit. Jesus Christ Our Lord, published a quarter of a century later, in 1969,
Based on the calculations applied below by the Library of Congress, I think The Doctrine of the Holy Spirit would go into the public domain on Jan. 1, 2039.

On the other hand, L. S. Chafer's should be close if not there – at least some of them. E.g., his Major Bible Themes was copyrighted in 1926. It can be downloaded from https://lewissperrychafer.org/Themes.pdf. Often publishers (or anyone else) will update or revise things like that to get a revised edition to be under copyright. Based on what the Library of Congress says (https://blogs.loc.gov/copyright/202...copyright-1926-works-enter-the-public-domain/), it looks to me as if writings (some? all?) copyrighted in the USA in 1926 became public domain on January 1, 2022.

I don't know about others of Lewis Sperry Chafer's books.
 
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I have much of Chafer's best in SwordSearcher already: https://www.swordsearcher.com/bible-study-library/chafer-essential-works.html but when I built that module a lot of his writings were still under copyright.

I will revisit this soon to get details but in order to keep the cost of SwordSearcher where it is, I don't typically license works that require royalties so it really comes down to publication date...
 
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