Ladders Social Studies 4: Native Americans of The Great Plains (on-level)
Ladders Social Studies 5: The Inca (above-level)
Ladders Social Studies 5: Los mayas (The Maya) (on-level)
Landscape Degradation: How Australia is Changing
United States Regions: Great Plains Region
Ladders Social Studies 5: The Aztec (on-level)
The Human Body in 3D: The Ear in 3D
Ladders Social Studies 4: Native Americans of the Southwest (on-level)
Ladders Social Studies 5: The Aztec (below-level)
Ladders Social Studies 4: Native Americans of The Great Plains (below-level)
Ladders Social Studies 5: The Pueblo (above-level)
United States Regions: West Coast Region
United States Regions: Appalachian Region
Ladders Social Studies 4: Las Grandes Llanuras (The Great Plains) (on-level)
Ladders Social Studies 4: Native Americans of the Pacific Northwest (below-level)