3

Marco Polo

3

Juan Ponce de León

3

Jacques Cousteau

3

Ferdinand Magellan

3

Vasco da Gama

3

Isthmuses of the World

3

Christopher Columbus

3

Ibn Battuta

3

David Livingstone

3

Magnetism

4

Maddy's Iowa Diary

3

John Cabot

3

Neil Armstrong

3

Daniel Boone

3

Samuel de Champlain

3

Leif Erikson

3

Edmund Hillary

3

Amerigo Vespucci

3

Roald Amundsen

3

Zheng He

3

Sacagawea

3

Jacques Cartier

3

John Smith

3

Francis Drake

3

James Cook