4

Stonehenge, England

3

Clayton Does The Unthinkable

3

David Livingstone

3

Clayton Does The Unthinkable

4

Washington Monument

4

Famous Americans: George Washington

4

Maddy's Washington Diary

4

Yellowstone National Park

3

Isaac Newton

4

Jewels, Gemstones, and Birthstones

4

Maddy's Washington, D.C. Diary

4

Maddy's Maryland Diary

4

Earthquakes

1

Things That Are Gray

4

Mount Rushmore

4

Maddy's Nevada Diary

4

Maddy's Delaware Diary

4

Maddy's Pennsylvania Diary

2

Things That Are Gray-Easy Reader Part 1

3

The Earth

3

Color Shades

3

Islands of the World

4

Maddy's Michigan Diary

4

Landmarks of the United States

4

Chip's Tips on Russia

2

Hilda Broomhead

3

Trenches of the World

2

Things That Are White-Easy Reader Part 2

2

Trouble at the Fair

1

Sports