Bracero History Archive
The Bracero History Archive—a collaborative project of George Mason University, the Smithsonian, Brown University, and the University of Texas, El Paso—is an online collection of resources that documents the Bracero program, a guest worker initiative where millions of Mexicans came to work in American agriculture during the mid-20th century.
There is a vast collection of oral histories recorded in Spanish as well as lesson plans and background information written in Spanish and English. (Select Spanish on the home page and then browse to find these resources in Spanish.)
The site also offers a search option in Spanish.