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- What was World War I?, by Nico Medina ; illustrated by Dede Putra
- What was World War I?, by Nico Medina ; illustrated by Dede Putra
- What was the Holocaust?, by Gail Herman ; illustrated by Jerry Hoare
- What was the Ice Age?, by Nico Medina ; illustrated by David Groff
- What were the Negro Leagues?, by Varian Johnson ; illustrated by Stephen Marchesi
- What were the Twin Towers?, by Jim O'Connor ; illustrated by Ted Hammond
- What were the Salem Witch Trials?, by Joan Holub ; illustrated by Dede Putra
- What was the San Francisco Earthquake?, by Dorothy and Thomas Hoobler ; illustrated by Ted Hammond
- What is the Declaration of Independence?, by Michael C. Harris ; illustrated by Jerry Hoare
- What was the Great Chicago Fire?, by Janet B. Pascal ; illustrated by Tim Foley
- What was Ellis Island?, by Patricia Brennan Demuth ; illustrated by David Groff
- What is the Panama Canal?, by Janet B. Pascal ; illustrated by Tim Foley
- What was Pompeii?, by Jim O'Connor ; illustrated by John Hinderliter