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Works copyrighted before 1964 had to have the copyright renewed sometime in the 28th year. If the copyright was not renewed the work is in the public domain. These records are in the online catalog found here: http://www.copyright.gov/records .
The original copyright registration for the March 1961 issue of Amazing Stories is B00000889125 on February 9, 1961. Four authors in this issue renewed article copyrights but the magazine was not renewed.
- "Playboy and the slime god" by Isaac Asimov (RE0000427469 / 1989-01-23)
- "A Dusk of idols" by James Blish (RE0000437740 / 1989-07-03)
- "Political machine" by John Jakes (RE0000443111 / 1989-11-02)
- Various introductions by Sam Moskowitz (RE0000438501 / 1989-05-30)