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- Iowa, Ann O. Squire
- Delaware, Melissa McDaniel
- Water, fire, food, Diane Vukovic ; [illustrations by Kate Francis]
- Solar power, by Laurie Brearley
- Missouri, Jennifer Zeiger
- All about crystals and gems, discovering treasures of the natural world, Libby Romero ; illustrated by Gary LaCoste
- Water power, energy from rivers, waves, and tides, by Laurie Brearley
- All about rocks, discovering the world beneath your feet, Alessandra Potenza ; illustrated by Gary LaCoste
- Women and the right to vote, Cynthia Chin-Lee
- Idaho, Melissa McDaniel
- Rediscovering the Titanic, by Michael Burgan
- Slippery slime, by Cody Crane
- North Dakota, Ann O. Squire
- Human missions to outer space, Laurie Calkhoven
- California, Lauren Newman
- Elizabeth I, Nel Yomtov
- Nevada, Josh Gregory
- Mount Rainier, by Joanne Mattern
- Oregon, Josh Gregory
- Ohio, Martin Gitlin
- Flowers, leaves, and other plant parts, Jacob Batchelor
- What's that plant?, Cody Crane
- Washington, Melissa McDaniel
- Oklahoma, Tamra B. Orr
- Arkansas, Martin Gitlin
- Animation, by Karina Hamalainen ; content consultant: Matthew Lammi, PhD, Assistant Professor, College of Education, North Carolina
- Planet Mercury, Ann O. Squire
- Planet Neptune, Ann O. Squire
- Minnesota, Martin Schwabacher
- West Virginia, Martin Schwabacher
- All about fossils, discovering dinosaurs and other clues to the past, Cody Crane ; illustrated by Gary LaCoste
- Joshua Tree, by Jodie Shepherd
- South Carolina, Barbara A. Somervill
- Wisconsin, Vicky Franchino
- South America, by Gloria Susana Esquivel
- Crazy plants, Karina Hamalainen
- Grand Teton, by Josh Gregory
- Moon, by Steve Tomecek
- Hawai'i volcanoes, Karina Hamalainen
- Australia and Oceania, by Barbara A. Somervill
- Starting your own business, Nel Yomtov
- The greenhouse effect, Mara Grunbaum
- The Bill of Rights, why it matters to you, Ruth Bjorklund
- Maryland, Vicky Franchino
- Yellowstone, by Audra Wallace
- Gettysburg, Moira Rose Donohue
- Utah, Josh Gregory
- Martin Luther King, Jr. Memorial, Christine Taylor-Butler
- Navigation, Jenny Mason ; [illustrations by Kate Francis]
- North Carolina, by Ann O. Squire