Di Imperatoribus Romanis: The Encyclopedia of the Roman Emerors. Pay particular attention to the 'Battle Index.'
Uniforms of the Mexican Revolution: A fast overview of the subject
University of Texas at El Paso Mexican Revolution Photo Collection:
Click on 'Search Data,' then Select Mexican Revolution as the 'Title,'
then click on the Start Search button.
Soldiers of Fortune Postcards This site contains some very interesting images of 'foreign' mercenaries in the revolution.
Naval Counter Intelligence Center 'Chapter 3' contains interesting information on
activities during the Mexican Revolution.
The Red Shadow: Coloinal Adventure Wargaming in Africa 1880-1920
Warflag: Flags for Wargames
Baker Street LA: Sherlockian Site (C'mon, it's Victorian)
Prescott of the Stratosphere Rangers: A 'Movie Serial' version of a Late 19th early 20th century adventure character created by a Hollywood CGI Efx company.
Back Of Beyond: Copplestone's Adventure in China figures

Wargames Foundry: See the 'Old West' and 'Victorian' lines
Eureka Miniatures: See the 'Civilian' and 'Mexican' lines
West Wind Productions: See the 'Cowboy Wars' line.
Old Glory: The Spanish American War Spanish Inf. make pretty good Carrancistas if you paint the hat to look like something other than the straw thing it's supposed to be.