Eu acho que você pode estar se lembrando de Onde tarde os Sweet Birds cantaram por Kate Wilhelm.
Semelhanças: pós-apocalíptico, esterilidade, família rica, clonagem, enclave.
Dissimilaridade: O enclave está na Virgínia, não na Pensilvânia.
Ganhou o Prêmio Hugo de melhor romance em 1977, de modo que está perto de sua estimativa de 1975.
Da cópia da sobrecapa:
It is the story of the Sumners of Virginia, who have ruled over a lush valley along the Shenandoah for generations. But the Sumner's land, their money, their influence do not make them immune to the war and pestilence that destroy the rest of the earth. Through the foresight of the elder Sumners, they create a scientific research center that provides them with a means of survival. But as the Sumner men become sterile, the women barren, young David Sumner, his cousin Celia, and the other Sumners become victimized by an army of look-alike, think-alike clones who are able to perpetuate their Sumner bodies - but not their humanity. What hope there is for a real, human future must lie with the outcasts of the new society.
Capa do ISFB -