Some information supplied by Tom Lammers and the Atlas/Timely discussion list. On-sale date from 1956 Periodicals, Copyright Office, Library of Congress.
Carter's party are told to keep away from the elephants' graveyard lest they offend the Elephant God. Carter doesn't believe in the warnings, only to be confronted by the 300 foot tall Elephant God.
In 1980, Bruce goes to sea to test his Histrometer and speak to people in the past. When a giant octopus menaces the ship he contacts his self in 1954 when he's serving in the US Navy and the Navy destroys the octopus then, removing it from 1980.
Miro tricks an old man into thinking he has telekinetic powers and can move objects. Because the old man is responsible for running the machine controlling Earth's gravity he thinks he's been derelict and modifies gravity so no one can move. Miro discovers he really is telepathic and sends a message to the old man to release people. Miro decides to work at a gas station rather than use his powers again.
Luke is afraid of going into battle. When the battle starts he turns to run but is shot in the back. His spirit returns to charge into battle, inspiring people by his seeming courage.
Peter Shield tries to contact other worlds while Earth is on the verge of World War III. When Jupiter contacts Earth they tell them they will destroy their planet unless they end all warfare. The threatened war doesn't happen.