When is the last time you thought about how you enter searches in a tool like Google?
Take a quick look through Google's How to Search on Google article, then go a step further and check out Refine Web Searches.
Making use of advanced search screens can help you hone your search skills!
Google Advanced Yahoo Advanced
Also -- try limiting your search by domain (.edu, .gov, .org, etc.) by typing site:.edu in the box along with your search terms.
This video describes the features of Google Advanced Search, which can help you focus your search results on exactly what you need.
Online newspapers from the Mexican Revolution Period:
The Library collections at the University of Texas at El Paso (UTEP) have photos from the Mexican Revolution Period:
Zapatistas! contains documents of the New Mexican Revolution
founded in 1985 by journalists and scholars to check rising government secrecy, the National Security Archive combines a unique range of functions: investigative journalism center, research institute on international affairs, library and archive of declassified U.S. documents ("the world's largest nongovernmental collection" according to the Los Angeles Times), leading non-profit user of the U.S. Freedom of Information Act, public interest law firm defending and expanding public access to government information, global advocate of open government, and indexer and publisher of former secrets.