Don Rosa: Return to Plain Awful?

[Tom Tanida]

Wasn't there a Don Rosa story featuring the Ducks' return (including
Scrooge) to Plain Awful (the land of the square shaped people)?  I seem
to remember one.  If so, I was wondering if I could get the comic title
(Uncle Scrooge or Uncle Scrooge Adventures, I'm guessing), and number.

Also, is there a "complete list of Don Rosa stories", like the
list of Carl Barks stories?

Thanks!
Tom
tanida at esosun.css.gov