Mickey Mouse comic books issue 121
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Published May 1969 by Dell/Gold Key.$7.20
Mickey Mouse in "The Mystery of the Mumbling Mountain" in which Mickey and Goofy are sent on a secret mission to Poco-Poco Island. Issue also has The Junior Woodchucks in "Mystic Music," one-page text story "Big Fake," and Gold Key Comics Club News pages throughout book. No art/story credits given. Inside front cover has advertisement for a club for the Banana Splits, a late 1960s Saturday morning cartoon show. Statement of Ownership, Management, and Circulation on last page states that the average monthly paid circulation of the comic is 233,630. 36 pages, full color. Cover price $0.15.