The Exchange, Wednesday, February 19, and Friday, February 21. February is Black History month, and we talk with one of the editors of a new book that contains first-person stories and photos of African Americans who were once enslaved. The interviews were done by writers with the Works Progress Administration in the 1930s. Also, a preview of a program at the Sioux City Public Museum this weekend where you can learn everything you need to know about the upcoming 2020 census that takes place