Merlin Effect has 430 pages.
The Fires of Merlin has 261 pages.
Merlin's Wood has 286 pages.
Merlin's Ring has 366 pages.
The Mirror of Merlin has 245 pages.
The Seven Songs of Merlin has 336 pages.
The Lost Years of Merlin has 326 pages.
The Wings of Merlin, a book in The Lost Years of Merlin series by T.A. Barron, has around 400 pages.
336
The ISBN of Merlin Effect is 978-0441012220.
The Ethos Effect has 509 pages.
The Entropy Effect has 224 pages.
The Fox Effect has 336 pages.