Google has the full text of Life magazine issues from 1936 – 1972. An incredible resource.
20th Century
The Light Horsemen (1987)
A fictionalized account of the Australian Light Horse Regiment in Palestine in 1917.
Atomic Comics and Stories
Comic Book Plus has a collection of “Atomic Comics” from the late 1940s through the 1950s that attempted to capitalize on the public’s fascination with atomic energy.
Uniform and Tactics Guide To The Mexican Revolution 1910 – 1920
Here’s a well-written guide to the the 1910 – 1920 Mexican Revolution.
Also, a timeline of the Revolution
Pancho Villa rides!
Battle of the Yellow Sea Scenario
My friend Jim loves to run dreadnaught era naval miniature wargames. Here’s a good scenario for the Battle of the Yellow Sea from Bill Madison of the Naval Wargames Society.