3

Famous Explorers

3

Magnetism

3

Isthmuses of the World

3

James Cook

3

Zheng He

3

Juan Ponce de León

3

David Livingstone

3

John Smith

3

Sacagawea

3

Marco Polo

3

Leif Erikson

3

Roald Amundsen

3

Jacques Cousteau

3

Ibn Battuta

3

John Cabot

3

Ferdinand Magellan

3

Jacques Cartier

3

Daniel Boone

3

Edmund Hillary

3

Vasco da Gama

3

Christopher Columbus

4

Maddy's Iowa Diary

3

Francis Drake

3

Samuel de Champlain

3

Amerigo Vespucci

3

Neil Armstrong