TUCSON, Ariz. (13 News) - Hispanic Heritage Month may be coming to a close, but local non-profit Portable Practical Educational Preparation celebrates the contributions of Mexicans to the United States every day through its museum.

Mexican farmworkers, a part of the Bracero Program, helped not just America, but also Arizona become an agricultural powerhouse.

And PPEP helped those farm workers strive for something more.

What started as a dream soon became a reality in 1967 when Dr. John Arnold became the driver, mechanic, and schoolteacher on his school bus “La Tortuga.”

And his students? The Mexican farmworkers from the Bracero Program.

“We would take the school to them, in La Tortuga, and they would come from the fields, get on the bus, and then they would do class work,” Arn

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