I recently acquired a book entitled "Buffalo County Nebraska in the World War, 1917, 1918, 1919" It appears to have been published locally about 1919. It contains short biographies and photographs of all the men and women who served in a capacity as a solider or a civilian or were part of a civilian supporting group/agency during World War I. Everyone who has a biography in the book has some kind of Buffalo County, Nebraska connection but, as I've discovered as I started working on biographies for those who died in the War, they didn't necessarily live in Buffalo County. The link is usually their parents.
I didn't see anywhere that this particular book was available online, so if anyone would like me to do a look up just send me a PM.
I also have a physical copy of the 1st Infantry Division history book and two University of Nebraska Cornhusker Annuals published during the World War I that contain some very useful short biographies for soldiers.