The grandmother and two great-aunts of Linda Arroyo-Holmstrom, of Lafayette, on a Sunday morning in 1929.

(Courtesy Boulder County Latino History Project)

Two bombings in Boulder in 1974 killed six Chicano activists, and their deaths have been described as "the most important unsolved crimes" in the city's history. 

But like the long history of Latinos in Boulder county, those crimes are largely left out of school curricula and published books, according to  organizers of the Boulder County Latino History Project, which formed a few years ago and this spring published two volumes covering 1900 until about 1980.

The books were written by retired University of Colorado Boulder professor Marjorie McIntosh. The project also collected oral histories, newspapers, photographs and other primary source materials that are now available online, and it trains teachers from around Colorado on how to incorporate Latino history into their lessons. The next training session starts Tuesday. 

Teacher Jason Romero interned with the project when he was a student at CU-Boulder and now uses the curriculum in his classes at STRIVE Prep-SMART Academy in Denver.

Romero told Colorado Matters host Ryan Warner he particularly likes the story of Emma Gomez Martinez, a Boulder Hispanic activist in the 1940s and 1950s.

"That's a story that's very powerful, especially for the young women in my class who can see somebody who is like them doing this type of work and making positive actions for the community," he said.