Standard, 1951 Series
 
Willie the Penguin #1
Willie the Penguin #2
Willie the Penguin #3
Issue 3
September 1951
Add/replace cover
Willie the Penguin #4
Issue 4
November 1951
Add/replace cover
Willie the Penguin #5
Issue 5
January 1952
Add/replace cover
Willie the Penguin #6