| 0 |
| 0 |
| 0 |
| 0 |
| 0 |
| 0 |
| 0 |
| 0 |
| 0 |
| 0 |
| 0 |
| 0 |
James Monroe, 5th president of the United States | 0 |
| 0 |
| 0 |
| 0 |
The Oregon Trail in American history | 0 |
| 0 |
| 0 |
| 0 |
The United States Coast Guard | 0 |
| 0 |
| 0 |
| 0 |
| 0 |
Independence and revolution in Mexico, 1810-1940 | 0 |
| 0 |
| 0 |
George H.W. Bush, 41st president of the United States | 0 |
| 0 |
| 0 |
| 0 |
| 0 |
| 0 |
Surviving the Oregon Trail | 0 |
| 0 |
| 0 |
| 0 |
| 0 |
Marco Polo and the medieval explorers | 0 |
| 0 |
| 0 |
| 0 |
| 0 |
| 0 |
| 0 |
| 0 |
| 0 |
| 0 |
William Henry Harrison, 9th president of the United States | 0 |
| 0 |
Children of the westward trail | 0 |
| 0 |
| 0 |
| 0 |
| 0 |
Richard M. Nixon, 37th President of the United States | 0 |
| 0 |
| 0 |
| 0 |
Vasco da Gama and the Portuguese explorers | 0 |
Charles Darwin and the evolution revolution | 0 |
| 0 |
| 0 |
| 0 |
| 0 |
| 0 |
| 0 |
Charles Darwin and the evolution revolution | 0 |
| 0 |
| 0 |
Before Columbus - Charles C. Mann
- Rebecca Stefoff
| 0 |
| 0 |
Stephen King - Rebecca Stefoff
- Carmen Bredeson
| 0 |
| 0 |
| 0 |
The Drug Enforcement Administration | 0 |