Not on PG doesn't mean anything other than they may not have been looked at. Astounding/Analog has been mostly looked at. Most other magazines are hit or miss. PG has not looked at all of Harry Harrison's short stories.
It's complex question to answer for any given story. The magazine may have filed a renewal or the author may have. Renewals were only required for works first published before 1964. It also mostly affects the U.S. copyright. Other countries did not have renewal requirements and only pay attention to the U.S. copyright if they implement a rule of sorter term clause.
Greg
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