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During decades of Jim Crow, African-American travelers couldn’t be sure what they’d face at a strange restaurant, a hotel, even a gas station. Would the door be slammed in their face, or worse? The Green Book, an annual listing of establishments welcoming black customers, started in the late ‘30s.We speak with Anne Bruder, a State Highway Administration historian who is researching Green Book businesses in Maryland.We also talk with Traci Wright of the Park School, who discusses the Green Book with students from several high schools on an annual Civil Rights trip and also with civil-rights icon Dr. Helena Hicks, who recalls using the guide when she traveled for her work. Original air date: August 8, 2017.