This is a curious short story by Philip K Dick, the author of Do Androids Dream of Electric Sheep which because the basis of Bladerunner. Most of his work centres on the ideas of identity, authenticity and agency – this one is no exception.
It’s available free on Project Gutenberg as the copyright for the magazine it was published in was never renewed. The need to renew copyright in the US was removed in 1978. The fact renewal was required before then allows a great deal of interesting work to enter the creative commons and gives it much more influence than still copyrighted but no longer published ‘dead’ works.