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3 of 3
1951
SQB
  • 39.1k
  • 33
  • 218
  • 356

Another stab in the dark: Wine of the Dreamers (1951) by John D. MacDonald. It does feature an (alien) underground city inhabited by children or childlike beings, although the underground city is not a major plot point.

SQB
  • 39.1k
  • 33
  • 218
  • 356