Clarion Books,, c1987.
150 p. : ill. ; 24 cm.

Maxwell Macmillan In, c1994.
200 p. : ill., maps ; 27 cm.

Blackbirch Press,, 1996.
p. cm.

National Geographic Society ;, 1996.
1 v. (unpaged) : col. ill., maps ; 28 cm.

National Geographic Society,, 1996.
1 v. (unpaged) : col. ill. ; 29 cm.

Philomel Books,, 2000.
52 p. : col. ill. ; 30 cm.

National Geographic Society,, 2000.
48 p. : col. ill. ; 28 cm.

Grosset & Dunlap,, c2003.
103 p. : ill. ; 21 cm.

National Geographic,, c2003.
39 p. : col. ill., map ; 29 cm.

Grosset & Dunlap,, c2004.
106 p. : ill. ; 20 cm.