3

Famous Explorers

3

Astronauts

3

Christopher Columbus

3

Jacques Cartier

3

Zheng He

3

James Cook

3

Vasco da Gama

3

Edmund Hillary

4

Maddy's Iowa Diary

3

Francis Drake

3

David Livingstone

3

Magnetism

3

Sacagawea

3

Isthmuses of the World

3

Neil Armstrong

3

Roald Amundsen

3

Ibn Battuta

3

Jacques Cousteau

3

Amerigo Vespucci

3

John Cabot

3

Juan Ponce de León

4

Table Mountain, South Africa

3

Daniel Boone

3

Samuel de Champlain

3

John Smith

3

Ferdinand Magellan

4

Maddy's Maryland Diary

3

Leif Erikson

3

Marco Polo