Cummings is credited with "The Princess of the Atom" in Captain America Comics, but without his actual name mentioned—the coming attraction in issue 24 just calls him the author of Girl in the Golden Atom. "The Princess of the Atom" two-parter uses the basic situation of "Girl in the Golden Atom"—miniaturizing into an atom world by means of a drug—but otherwise is a new plot.
The noticeable style characteristic on "Princess" that led me to the first of the other stories is "Oh migosh."
He's known to have written Sub-Mariner and the Human Torch too, but so far, concentrating on Cap, I have yet to run across any stories of those characters by him. Another pass through the Caps may well find more Cummings stories.
Ray Cummings scripts on Captain America
|Apr/43||25||The Princess of the Atom|
|May/||26||The Princess of the Atom Part II|
|June/||27||North of the Border|
|Aug/||29||The King of the Dinosaurs|
|The Case of the Phantom Engineer|
|The Case of the Headless Monster|
|Sep/||30||The House of the Laughing Death|
on Captain America in All Winners
|Win/43-44||11||The Case of the Yellow Fire Monster|
on Captain America in U.S.A. Comics
|Sep/43||10||The Cylinder of Death|