New on Archive.org, a microfilm run of The Author & Journalist 1916-1969 magazine (initially The Student Writer, to 1923). November 1952 has one of a series giving August Derleth’s memories of “Becoming a writer”. In the same issue “New Pulps”…
“The pulp magazines, booming again [after the post-war shortages and disruption, and] … science-fiction is hot”
There are also short summary articles on the trade, such as “The Pulp Situation” in March 1941, which writes… “The terror and horror mystery period is over” due to the war.
Includes the 1948 “Lovecraft on Story Construction”, via Rimel.
Doubtless there’s more to be found in such a long run, and one can search across the full-text. The run is “to borrow” only.
Popping rather more fully into public availability… the entire digitized copyright-expired artwork of the British Isles. A UK Court of Appeal ruling… “confirms that museums do not have valid copyright in photographs of (two-dimensional) works which are themselves out of copyright. It means these photographs are in the public domain, and free to use.” Feel free to use for book covers, AI training, t-shirts, etc.