The Mystery of the Flying Express Formats:

1) Brown/Yellow/Orange Gretta
2) Tweed/Yellow/Orange Gretta
3) Tweed/Yellow/Brown Multipic
4) PC/Brown Multipic
5) PC/White Multipic

Illustrators:

1) Paul Laune - 1941
2) John Leone - 1962
3) Rudy Nappi - 1970

Authors:

1) John Button
2) Vincent Buranelli

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