Aha! Further research reveals a reference to the original's being a short story. This person does not deign to give the title, but I am 99% certain it is "In Iron Years" (first published in 1974). The person who wrote to Dickson was Harry Frank of the University of Michigan psychology department.
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Date: 2012-10-19 04:52 pm (UTC)I now declare this horse dead. :)