Atheneum Books for Young Readers,, c2005.
xiii, 176 p. : ill. ; 29 cm.

Compass Point Books,, c2006.
112 p. : ill. (some col.), col. maps ; 24 cm.

Philomel Books,, c2007.
1 v. (unpaged) : col. ill. ; 29 cm.

Albert Whitman,, c2007.
1 v. (unpaged) : col. ill., col. map ; 26 cm.

Houghton Mifflin Co.,, 2007.
1 v. (unpaged) : col. ill. ; 24 x 28 cm.

Grosset & Dunlap,, c2008.
104 p. : ill., maps ; 20 cm.

Scholastic Press,, 2008.
1 v. (unpaged) : col. ill. ; 32 cm.

Penguin Group,, 2008.
1 v. (unpaged) : col. ill. ; 32 cm.

Hyperion Books for Children,, c2008.
1 v. (unpaged) : col. ill. ; 29 cm.

DK Pub. ;, 2013.
72 p. : ill. (some col.), col. map ; 29 cm. + 1 CD-ROM (4 3/4 in.) + 1 wall chart (58 x 80 cm.)