The Secret of the Lost Tunnel Formats:

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

Illustrators:

1) Bill Gillies - 1950
2) Rudy Nappi - 1968

Authors:

1) Andrew Svenson
2) David Grambs, June Dunn & Priscilla Baker-Carr

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