[HarryT]

Originally Posted by dhbailey

The following link lists Murray Leinster's copyrighted works, which includes Four From Planet 5, which is the alternate title for this work.

http://cocatalog.loc.gov/cgi-bin/Pwe...&CNT=25&HIST=1

That's probabily preferring to the book version of the work, rather than the magazine version, which carries a separate copyright. The magazine copyright was not renewed (as used to be required) in the US, hence that version of it is now in the public domain the US. However, most country's copyrights don't work like that, but simply so many years after the author's death, hence this should not be downloaded by people who live in such a country (which, in effect, means virtually everyone outside the US).