DK Pub., Inc.,, 2003, c1996.
304 p. : ill. (some col.), col. maps ; 29 cm.

Childrens Press,, c1986.
127 p. : col. ill. ; 25 cm.

Grolier Educational,, 2003.
6 v. ; cm.

Lerner Publications Co.,, [1975, c1973]
vii, 99 p. illus. (part col.) 22 x 23 cm.

DK,, 2006.
304 p. : col. ill., col. maps ; 28 cm.

Gale,, c2003.

Gale Group,, c2001.

Gale Group,, c2002.

Grolier Educational,, 1998 (2002 printing)
10 volumes : illustrations (some color) ; 29 cm

National Geographic,, c2009.
64 p. : col. ill., col. maps ; 25 cm.