Originally Posted by Elfwreck
And prolific authors who didn't keep extensive records of what they published where, were likely to not update the copyright; the copyright office didn't send out "your copyright is about to expire!" notices. Besides, how much income would Asimov expect to make, in 1968, on a story he published in 1941?
Ah, but Asimov had a borderline-OCD record system and in the 60s became aware that he could make real money from reprints of his short stories. He even wrote a sort-of-autobiography about his history with the pulps, interspersed with the short stories themselves. If you have any interest in Asimov, the Golden Age of Science-Fiction or pulps, I really recommend The Early Asimov
. It's a great read.