Philip K. Dick
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Early victories by the USSR in a global nuclear war cause the United Nations government to retreat to the moon leaving behind troops and fierce autonomous robots called “Claws”, which reproduce and redesign themselves in unmanned subterranean factories. After six bloody years of conflict the Soviets call for an urgent conference and UN Major Joseph Hendricks sets out to meet them. Along the way he will discover what the Claws have been up to, and it isn’t good… - Second Variety was first published in the May 1953 edition of Space Science Fiction Magazine.
I love this story. With many twists and many turns it's an excellent read. The ending is perfect;)
For a free book this was an amazing short story! Well worth the read awesome plot.