Where Late the Sweet Birds Sang
A science fiction work by Kate Wilhelm, published in 1976. The book contains three closely linked novellas about a future United States destroyed by ecological catastrophe and sterility. The main characters retreat into a private enclave and maintain their population via cloning and forced breeding of the few fertile women. (See Margaret Atwood's The Handmaid's Tale for a different take on this theme.)
This book won the Hugo Award for best novel in 1977.