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- Sloth wasn't sleepy, Kate Messner ; illustrated by Valentina Toro
- Over and under the waves, by Kate Messner ; with art by Christopher Silas Neal
- Sea Monster and the bossy fish, by Kate Messner ; illustrated by Andy Rash
- Messner, Kate, Ranger in time, 9
- The brilliant fall of Gianna Z., Kate Messner
- Escape from the great earthquake, Kate Messner ; illustrated by Kelley McMorris
- The American Revolution, Kate Messner ; illustrated by Justin Greenwood
- Chirp, by Kate Messner
- Rescue on the Oregon trail, Kate Messner ; illustrated by Kelley McMorris
- Tracking tortoises, the mission to save a Galápagos giant, Kate Messner
- The scariest kitten in the world, by Terrifying Kitten (with help from Kate Messner) ; illustrated by MacKenzie Haley
- Breakout, by Kate Messner
- Solve this, forensics : super science and curious capers for the daring detective in you, Kate Messner and Anne Ruppert
- Danger in Ancient Rome, Kate Messner ; illustrated by Kelley McMorris
- Long road to freedom, Kate Messner ; illustrated by Kelley McMorris
- Christopher Columbus and the Taino people, Kate Messner and José Barreiro ; illustrated by Falynn Koch
- Tracking pythons, the quest to catch an invasive predator and save an ecosystem, Kate Messner
- Messner, Kate, Ranger in time, 10
- Hide and seek, Kate Messner
- The brilliant deep, rebuilding the world's coral reefs : the story of Ken Nedimyer and the Coral Restoration Foundation, Kate Messner ; [illustrated by] Matthew Forsythe
- Messner, Kate, Fergus and Zeke
- The Underground Railroad, Kate Messner and Gwendolyn Hooks ; illustrated by Damon Smyth
- Over and under the pond, by Kate Messner with art by Christopher Silas Neal
- Fergus and Zeke and the 100th day of school, Kate Messner ; illustrated by Heather Ross
- Attack on Pearl Harbor, Kate Messner ; illustrated by Kelley McMorris
- Marty McGuire has too many pets!, by Kate Messner ; illustrated by Brian Floca
- Marty McGuire digs worms!, by Kate Messner ; illustrated by Brian Floca
- Over and under the snow, by Kate Messner ; with art by Christopher Silas Neal
- Over and under the rainforest, by Kate Messner ; with art by Christopher Silas Neal
- Fergus and Zeke for president, Kate Messner ; illustrated by Heather Ross
- Insect superpowers, 18 real bugs that smash, zap, hypnotize, sting, and devour!, by Kate Messner ; illustrated by Jillian Nickell
- Plagues and pandemics, Kate Messner ; illustrated by Falynn Koch ; with a special thanks to Ella Messner, who served as a researcher and contributor for this book
- Journey through ash and smoke, Kate Messner ; illustrated by Kelley McMorris
- Marty McGuire, by Kate Messner ; illustrated by Brian Floca
- Over and under the canyon, by Kate Messner ; with art by Christopher Silas Neal
- Manhunt, Kate Messner
- Sea monster's first day, by Kate Messner ; illustrated by Andy Rash
- Messner, Kate, History smashers
- Pearl Harbor, Kate Messner ; illustrated by Dylan Meconis ; with special thanks to Maggie Tokuda-Hall, who served as an early reader and consultant for this book
- Hurricane Katrina rescue, Kate Messner ; illustrated by Kelley McMorris
- Fergus and Zeke at the science fair, Kate Messner ; illustrated by Heather Ross
- The next president, the unexpected beginnings and unwritten future of America's presidents, Kate Messner ; [illustrations] Adam Rex
- Tree of wonder, the many marvelous lives of a rainforest tree, by Kate Messner ; illustrated by Simona Mulazzani
- Capture the flag, Kate Messner
- Messner, Kate, Ranger in time, 12
- Fergus and Zeke, Kate Messner ; illustrated by Heather Ross
- Eye of the storm, Kate Messner
- The exact location of home, Kate Messner
- Dr. Fauci, how a boy from Brooklyn became America's doctor, Kate Messner ; illustrated by Alexandra Bye
- Fergus and Zeke and the field day challenge, Kate Messner ; illustrated by Heather Ross
- Tracking pythons, the quest to catch an invasive predator and save an ecosystem, Kate Messner
- Christopher Columbus and the Taino people, Kate Messner and José Barreiro ; illustrated by Falynn Koch
- The scariest kitten in the world, by Terrifying Kitten (with help from Kate Messner) ; illustrated by MacKenzie Haley
- Tracking tortoises, the mission to save a Galápagos giant, Kate Messner
- Chirp, by Kate Messner
- Over and under the canyon, by Kate Messner ; with art by Christopher Silas Neal
- Fergus and Zeke and the field day challenge, Kate Messner ; illustrated by Heather Ross
- Disaster on the Titanic, Kate Messner ; illustrated by Kelley McMorris
- The Titanic, Kate Messner ; illustrated by Matt Aytch Taylor
- The Mayflower, Kate Messner ; illustrated by Dylan Meconis
- Once upon a book, by Grace Lin and Kate Messner ; illustrated by Grace Lin
- Journey through ash and smoke, Kate Messner ; illustrated by Kelley McMorris
- Women's right to vote, Kate Messner ; illustrated by Dylan Meconis
- Over and under the rainforest, by Kate Messner ; with art by Christopher Silas Neal
- Pearl Harbor, Kate Messner ; illustrated by Dylan Meconis ; with special thanks to Maggie Tokuda-Hall, who served as an early reader and consultant for this book
- Fergus and Zeke for president, Kate Messner ; illustrated by Heather Ross
- Insect superpowers, 18 real bugs that smash, zap, hypnotize, sting, and devour!, by Kate Messner ; illustrated by Jillian Nickell
- The Underground Railroad, Kate Messner and Gwendolyn Hooks ; illustrated by Damon Smyth
- Solve this, forensics : super science and curious capers for the daring detective in you, Kate Messner and Anne Ruppert
- Sloth wasn't sleepy, Kate Messner ; illustrated by Valentina Toro
- Over and under the waves, by Kate Messner ; with art by Christopher Silas Neal
- Attack on Pearl Harbor, Kate Messner ; illustrated by Kelley McMorris
- Escape from the Twin Towers, Kate Messner ; illustrated by Kelley McMorris
- Only the best, the exceptional life and fashion of Ann Lowe, by Kate Messner and Margaret E. Powell ; illustrated by Erin K. Robinson