Only a psychotic could find grounds to kill in the nearly-empty cities of Earth.

And singularly strange: though the cities of Earth were very various, none was like this.

I see trade between the inhabited nebulae, as if they were the legendary cities of old Earth.

In microcosm, the great cities of Earth were brought back to life.

I had spent most of my life in the cities of Earth, where any flying vehicle is illegal unless fully automated.

In the cities of Earth, the ultimate luxury had been building space.

It's a map of the transport system, and those little circles must be the other cities of Earth.

They were showing Scarecrows present in all the major cities of Earth.

Only gradually does the reader come to realize that the man was extremely lonely even in the crowded cities of Earth.

These duplications were already beginning to be sent down into the cities of Earth.