ALTERNATING CURRENTS (1956) - an early collection of stories by Frederik Pohl. This was the first appearance in a Pohl collection for any of this set. Several of these appear in later collections, including 2 stories in The Best of Frederik Pohl - but 3 have not been re-collected.

Happy Birthday, Dear Jesus
The Ghost Maker
Let the Ants Try
Pythias
The Mapmakers
Rafferty's Reasons
Target One
Grandy Devil
The Tunnel Under the World
What to Do Til the Analyst Comes - (original title: "Everybody's Happy But Me!")

Original appearances from 1949 to 1955: most from Galaxy, plus Planet Stories, Beyond, Fantastic Universe, Imagination. "Happy Birthday, Dear Jesus" was original to the 1956 collection.