Publisher: Random House
First Printed: 1972
Cover Art by Ed Vebell
Internal Illustrations by Jack Hearne

Trade Edition First Printing Identification:
-- Back cover list to The Mystery of the Nervous Lion

Additional Trade Edition First Printing Characteristics:
-- Matte cover finish
-- Blue graveyard/spiderweb endpapers
-- Rear Inner list to The Mystery of the Shrinking House

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

First Printing Identification: 1234567890 numberline on the copyright page.

Notes:
-- The cover art for this edition was changed in its Tenth Printing (1981) to the Robert Adragna work shown below. This change in cover art did not require an edition change.

Common Name: Hitchcock Cover
First Printed: 1981, Tenth Printing
Cover Art by Robert Adragna
Internal Illustrations by Jack Hearne

First Printing Identification: 0 numberline on the copyright page.

Publisher: Scholastic Book Services
First Printed: February 1982
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.