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As time passes and towns grow or shrink, first-hand knowledge about important places fades away. A new virtual trail of African-American heritage in Anne Arundel County aims to halt that loss and preserve historical sites, from the past four centuries.Jane Cox, of the county’s Office of Planning and Zoning, tells us about putting the online trail together. And Lyndra Marshall recounts how they collected oral histories from residents, including memories of segregated beaches and schools.