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- Mystery at the Washington Monument, by Ron Roy ; illustrated by Timothy Bush
- A thief at the National Zoo, by Ron Roy ; illustrated by Timothy Bush
- Trapped on the D.C. train!, by Ron Roy ; illustrated by Timothy Bush ; [cover illustration by Greg Swearingen]
- A spy in the White House, by Ron Roy ; illustrated by Timothy Bush
- The skeleton in the Smithsonian, by Ron Roy ; illustrated by Timothy Bush
- Christmas cricket, by Eve Bunting ; illustrated by Timothy Bush
- Trouble at the Treasury, by Ron Roy ; illustrated by Timothy Bush
- The election-day disaster, by Ron Roy ; illustrated by Timothy Bush
- Fireworks at the FBI, by Ron Roy ; illustrated by Timothy Bush
- Who broke Lincoln's thumb?, by Ron Roy ; illustrated by Timothy Bush
- The ghost at Camp David, by Ron Roy ; illustrated by Timothy Bush
- The secret at Jefferson's mansion, by Ron Roy ; illustrated by Timothy Bush
- Mystery at the Washington Monument, by Ron Roy ; illustrated by Timothy Bush
- A thief at the National Zoo, by Ron Roy ; illustrated by Timothy Bush
- Trapped on the D.C. train!, by Ron Roy ; illustrated by Timothy Bush ; [cover illustration by Greg Swearingen]
- A spy in the White House, by Ron Roy ; illustrated by Timothy Bush
- The skeleton in the Smithsonian, by Ron Roy ; illustrated by Timothy Bush
- Christmas cricket, by Eve Bunting ; illustrated by Timothy Bush
- Trouble at the Treasury, by Ron Roy ; illustrated by Timothy Bush
- The election-day disaster, by Ron Roy ; illustrated by Timothy Bush
- Who broke Lincoln's thumb?, by Ron Roy ; illustrated by Timothy Bush
- Fireworks at the FBI, by Ron Roy ; illustrated by Timothy Bush
- The ghost at Camp David, by Ron Roy ; illustrated by Timothy Bush
- The secret at Jefferson's mansion, by Ron Roy ; illustrated by Timothy Bush