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| title | media type | ISBN-13 | year of publica- tion | other author(s) | |
|---|---|---|---|---|---|
| Art Auction Mystery | Hardcover | 978-0-7534-1068-4 | 2005 | ||
| Art Auction Mystery | " | 978-0-7534-5842-6 | 2005 | ||
| Art Fraud Detective | Paperback | 978-0-7534-1195-7 | 2005 | ||
| Art Fraud Detective | Hardcover | 978-0-7534-5308-7 | 2000 | ||
| Art Fraud Detective: Spot the Difference, Solve the Crime | " | 978-0-7534-0478-2 | 2000 | ||
| Der große Kunstbetrug. Finde die Fälschung - du bist der Detektiv! | Gebundene Ausgabe | 978-3-7607-4820-7 | 2004 | Martha Gavin | |
| Farm Peepers | Hardcover | 978-1-84362-488-2 | 2005 | ||
| Follow the Kite | Paperback | 978-0-00-136053-2 | 1998 | ||
| I Can Add | Spiral-bound | 978-0-7534-5238-7 | 2000 | ||
| I Can Multiply | " | 978-0-7534-5414-5 | 2001 | ||
| I Can Spell Words with Four Letters | Hardcover | 978-0-7534-0173-6 | 1998 | ||
| I Can Spell Words with Four Letters | Spiral-bound | 978-0-7534-5125-0 | 1998 | ||
| I Can Spell Words with Three Letters | " | 978-0-7534-0172-9 | 1998 | ||
| I Can Spell Words with Three Letters | " | 978-0-7534-5124-3 | 1998 | ||
| I Can Subtract | " | 978-0-7534-5239-4 | 2000 | ||
| Jungle Peepers | Hardcover | 978-1-84362-489-9 | 2005 | ||
| Kunstfälschern auf der Spur | Gebundene Ausgabe | 978-3-7607-4703-3 | 2002 | ||
| Let's Learn Sizes | Hardcover | 978-1-84236-140-5 | 2002 | ||
| Magnificent Mazes 20th Century | Paperback | 978-1-84248-071-7 | 2003 | ||
| Magnificent Mazes | " | 978-1-84248-072-4 | 2006 | ||
| Meuh, la vache ! | Cartonné | 978-2-01-392804-5 | 2004 | Jonathan Bentley | |
| People Peepers | Hardcover | 978-1-84362-487-5 | 2005 | ||
| Pet Peepers | " | 978-1-84362-486-8 | 2005 | ||
| PIRATEN - Die total verrückte Schatzkarte | CD-ROM | 978-3-89835-330-4 | 2004 | ||
| Tatort Kunstauktion: Leg den Fälschern das Handwerk | Gebundene Ausgabe | 978-3-8369-5161-6 | 2007 | ||
| Terrormazia | Paperback | 978-1-84428-551-8 | 2005 | ||
| The Amazing Voyage of Charles Darwin | " | 978-1-877003-28-8 | 2003 | ||
| The Great Art Scandal | Hardcover | 978-0-7534-5587-6 | 2003 | ||
| The Great Art Scandal: Crack the Crime Save the Show | " | 978-0-7534-0811-7 | 2003 | ||
| The Great Race Maze | Paperback | 978-1-877003-07-3 | 2007 | ||