A notebook belonging to missing UC Davis student Linnea Lomax was found just off the American River bike trail, her family announced Sunday.

It was the first solid lead since her disappearance June 26, said Craig Lomax, the girl’s father, at a Sunday news conference.

The notebook was found near the Sutter Medical Center outpatient facility on Howe Avenue where the 19-year-old Placerville woman was last seen. She was receiving treatment after having a mental breakdown while studying for finals, her father said.

The evidence has been turned over to police, but Lomax confirmed it belonged to his daughter.

“I saw the handwriting on the notebook,” he said. “It was Linnea’s.” The notebook was found during a search by 250 volunteers over the weekend.