The Emerald Conspiracy (Puzzle adventure)
by Mark Fowler
ISBN 13: 9780746052532
Format: Paperback (48 pages) Publisher: Usborne Publishing Ltd Published: 28 Jun 2002
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Logic Puzzles (Usborne Superpuzzles S.)
by Mark Fowler,Rahdi Parekh,Radhi Parekh,Sarah Dixon
ISBN 13: 9780746007334
Format: Paperback (48 pages) Publisher: Usborne Publishing Ltd Published: 31 Dec 1994
The Invisible Spy (Usborne Puzzle Adventures)
by Peter Wingham, Mark Fowler
ISBN 13: 9780746005118
Format: Hardcover (48 pages) Publisher: Usborne Publishing Ltd Published: 30 Nov 1993