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David Groff

What Was the Ice Age?
Where Is Alcatraz?
What Is the Super Bowl?
Who Was Mother Teresa?
Where Is the White House?
What Was the Hindenburg?
Who Was Clara Barton?
What Was Ellis Island?
Who Was Alexander Graham Bell?
What Was the Alamo?

Books

What Was the Ice Age?
Where Is Alcatraz?
What Is the Super Bowl?
Who Was Mother Teresa?
Where Is the White House?
What Was the Hindenburg?
Who Was Clara Barton?
What Was Ellis Island?
Who Was Alexander Graham Bell?
What Was the Alamo?