Pebble in the Sky was originally written in the summer of 1947 under the title "Grow Old with Me" for Startling Stories, whose editor Sam Merwin, Jr. had approached Asimov to write a forty thousand word short novel for the magazine.
In 1949, Doubleday editor Walter I. Bradbury accepted the story on the suggestion of Frederik Pohl, on the condition it was expanded to seventy thousand words and the title changed to something more science fiction oriented; it was published in January 1950 as Pebble in the Sky.
[1] The Stars, Like Dust was originally serialised under the title Tyrann in Galaxy Science Fiction from January to March 1951, and was published as a novel by Doubleday later that year.
The novel was reprinted in with the Foundation Trilogy, The Naked Sun and I, Robot in a hardback selected works edition in 1982 by Littlehampton Book Services.
The Currents of Space was originally serialised in Astounding Science Fiction from October to December 1952 before being published by Doubleday as a novel the same year.
Their main common points are Asimov's idea of a future Galactic Empire, certain aspects of technology — hyperdrive, blaster pistols, "neuronic whips", the possible invention of the "Visi-Sonor" — and particular locations, such as the planet Trantor.