Carl Barks got many of his plot ideas for his comic book stories from various outside sources. A selection can be browsed HERE. Sometimes he even borrowed plot ideas from himself! A selection can be browsed HERE. And sometimes he would even use gags or episodes from Disney cartoons, which he was very familiar with as he had been Story Director on many of them. The sub-pages show you examples of such sources of relatively plain to see from where Barks drew some of his inspiration.
The pages are divided into unrealised and released cartoons (you can see more of Barks' involvement HERE), and the examples are placed in chronological order following the comic books' individual publishing dates.