#23 The Mystery of the Invisible Dog

By M.V. (Mary Virginia) Carey, 1975
RH hardbound 1975
Hitchcock Cover pb 1981
Keyhole pb 1984
Back to the Original Series page.
Random House Revised Paperback Edition
"Keyhole Cover"

First Printed: 1984
Cover Art: Robert Adragna
Internal Illustrations: None
ISBN: 0-394-86423-9

First Printing Identifier: 1234567890 numberline on the copyright page.
Random House First Paperback Edition
"Hitchcock Cover"

First Printed: 1981
Cover Art: Robert Adragna
Internal Illustrations: None
ISBN: 0-394-84492-0

First Printing Identifier: 1234567890 numberline on the copyright page.

Notes: As with all of The Three Investigators paperback titles printed in 1981, this book can be found with the Mystery Quiz/Bookmark page attached inside the front or back cover.

Random House Trade and GLB Hardbound Editions

First Printed: 1975
Cover Art: Jack Hearne
Internal Illustrations: Jack Hearne
ISBN's: Trade Ed. 0-394-83105-5; GLB 0-394-93105-X

Trade & GLB Edition First Printing Identifier: 1234567890 numberline on the copyright page.

Other Trade Edition First Printing Traits:
- Matte cover finish
- Plain white endpapers (see exception below)
- Back cover lists to "The Mystery of the Invisible Dog"

Notes:
1.) This was the last title to be issued with the matte covers.
2.) Plain white endpapers were standard starting with this book.  However, there are a few known examples of this title that have the blue graveyard endpapers.  This is apparently the result of the manufacturer using up leftover materials.


- As shown to the left, later printings of the GLB Edition used Robert Adragna's cover art.  These are quite difficult to find.

First Printed: circa 1981
Cover Art: Robert Adragna
Internal Illustrations: Jack Hearne
ISBN: Same as above for GLB

First Printing Identifier: 7890 numberline on the copyright page. (The first 6 printings featured the Hearne cover art.)