Gale,, c2003.

National Geographic,, [2021]
215 pages : color illustrations, color maps ; 30 cm.

Children's Press, an imprint of Scholastic Inc.,, [2013]
144 pages : illustrations (some color), color maps ; 24 cm.

Gale Group,, c2001.

Gale Group,, c2002.

National Geographic,, [2014]
143 pages : illustrations (chiefly color), color maps ; 29 cm