Publisher: Random House
First Printed: 1971
Cover Art by Harry Kane
Internal Illustrations by Harry Kane

Trade Edition First Printing Identification:
-- Back cover list to The Mystery of the Nervous Lion
-- Copyright Page details: click here

Additional Trade Edition First Printing Characteristics:
-- Matte cover finish
-- Blue graveyard/spiderweb endpapers
-- Rear inner list to The Mystery of the Nervous Lion
-- ISBN on the back cover

Notes:
-- Flaming Footprints and The Mystery of the Nervous Lion were the first new Three Investigators titles to receive ISBNs.

Publisher: Random House
Common Name: Marchesi Cover
First Printed: 1978
Cover Art by Stephen Marchesi
Internal Illustrations by Harry Kane

First Printing Identification: 1234567890 numberline on the copyright page.

Notes:
-- The cover art for this edition was changed in its Eighth Printing (1982) to the Robert Adragna work shown below. This change in cover art did not require an edition change.

Common Name: Hitchcock Cover
First Printed: 1982, Eighth Printing
Cover Art by Robert Adragna
Internal Illustrations by Harry Kane

First Printing Identification: 890 numberline on the copyright page.

Publisher: Scholastic Book Services
First Printed: September 1980
Cover Art by Charles Liese
Internal Illustrations: None

First Printing Identification: 12 11 10 9 8 7 6 5 4 3 2 1 numberline on the copyright page.

Publisher: Random House
Common Name: Keyhole Cover
First Printed: 1984
Cover Art by Robert Adragna
Internal Illustrations: None

First Printing Identification: 1234567890 numberline on the copyright page.