Not sure if this is the correct copyright law citation as IANAL. If correct, then the story's copyright expired before Abelard posted it.
304. Duration of copyright: Subsisting copyrights
(a) Copyrights in Their First Term on January 1, 1978.—
(1)(A) Any copyright, in the first term of which is subsisting on January 1, 1978, shall endure for 28 years from the date it was originally secured.