Came across these links to various downloadable digitised official histories that you may find useful covering France/Germany/Austria-Hungary/USA/Britain and Empire.
A goldmine of information on WW1 if you dig a little :)
Covers everything from 7 volumes (in English!) on the history of the Austro-Hungarian army offensives against Serbia/Italy/Russia (with lots of maps) to the 3 volumes covering the German naval war in the Baltic.
Land Warfare:
http://defenceindepth.co/2015/03/30/digital-first-world-war-resources-online-official-histories-the-war-on-land/
http://defenceindepth.co/2015/01/19/digital-first-world-war-resources-online-archival-sources/
Sea/Air Warfare:
http://defenceindepth.co/2015/08/19/digital-first-world-war-resources-online-official-histories-the-war-at-sea-and-in-the-air/
Hope some of you find them useful 8)
Cheers
Peter
Great find.
Lots of digging to do :)
wow, that is a lot of info.