Whatever Happened to Professor Potts? (Usborne Solve It Yourself)
by Phil Roxbee Cox
ISBN 13: 9780746020524
Format: Hardcover (48 pages) Publisher: Usborne Publishing Ltd Published: 31 Oct 1994 Other Format: Paperback
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Magic Toyshop: What's the Difference? (Usborne Picture Puzzles)
by Phil Roxbee Cox, Rupert Heath
ISBN 13: 9780746028476
Format: Paperback (32 pages) Publisher: Usborne Publishing Ltd Published: 31 Jan 1998 Other Format: Hardcover
Who Stole the Black Diamond? (Usborne Solve it Yourself S.)
ISBN 13: 9780746020548
Format: Hardcover (48 pages) Publisher: Usborne Publishing Ltd Published: 31 May 1995