U.S. Marine Corps
|
|
3.4 |
|
|
U.S. Coast Guard
|
|
3.3 |
|
|
La Fuerza Aérea de los Estados Unidos (U.S. Air Force)
|
|
3.7 |
|
|
Dogs
|
|
|
|
|
U.S. National Guard
|
|
3.5 |
|
|
La Guardia Nacional de los Estados Unidos (U.S. National Guard)
|
|
3.6 |
|
|
U.S. Army
|
|
3.3 |
|
|
Texas Revolution
|
|
2.9 |
|
|
Immigration through Ellis Island
|
|
2.9 |
|
|
Siento confianza (I Feel Confident)
|
|
|
|
|
La Marina de Guerra de los Estados Unidos (U.S. Navy)
|
|
3.0 |
|
|
Chimpanzees
|
|
|
|
|
U.S. Air Force
|
|
3.0 |
|
|
Science Behind the Colors (12 titles)
|
|
|
|
|
U.S. Navy
|
|
3.1 |
|
|
El Ejército de los Estados Unidos (U.S. Army)
|
|
3.5 |
|
|
September 11th Attacks
|
|
3.0 |
|
|
La Guardia Costera de los Estados Unidos (U.S. Coast Guard)
|
|
3.2 |
|
|
Las Fuerzas Armadas de los Estados Unidos (U.S. Armed Forces) (6 titles)
|
|
|
|
|
U.S. Armed Forces (6 titles)
|
|
|
|
|
Louisiana Purchase
|
|
2.9 |
|
|
El Cuerpo de Marines de los Estados Unidos (U.S. Marine Corps)
|
|
3.4 |
|
|
Crows
|
|
|
|
|
Los estados mentales (States of Mind) (4 titles)
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|
|
|
|
