At head of title on cover: The Encyclopedia Britannica / Getty Images.
"1850 to present"--Cover.
Includes index.
"2,000 historical photos ; 6,000 chronological entries ; plus 20,000 more photos on an enclosed CD-ROM ; plus 2 million photos available online ; plus 10 million Britannica facts available online"--Cover.
Accompanying CD-ROM title statement: History of the world in photographs : 20,000 photos / presented by Getty Images.