The cover image was computer-generated for e-book versions

The individual illustrations were originally to the left or right of the text associated with that illustration. Those illustrations have been moved to be after the associated text.

The tables have been reformatted to fit the formatting of a text file.

The illustration "THE BATTLEGROUND OF THE NATIONS" has been moved before the section "THE NATIONS AT WAR".

On page 10, "ZEPELLINS" was replaced with "ZEPPELINS".