OKLAHOMA CITY - Another historic discovery was made at an Oklahoma City high school.
Several blackboards with writings and student drawings from 1917 were hidden behind the walls.
The work assignments of teachers from nearly 100 years ago were found still intact.
School officials say the images were found in four classrooms.
Staff members at Emerson High School are fascinated with these findings.
"It's like you're walking into a time capsule that's been preserved," said Sherry Kishore, principal.
Just before the new year, even more images were discovered.
Contractors discovered a hand drawn calendar, a 3-D image of a house and map showing parts of our state.
Oklahoma City Public Schools have been working on ways to save and protect these pieces of history.
"We covered the chalk drawings with a plexy glass covering that's sealed to protect it from any type of air movement or from anybody touching it," said Scott Randall, Chief Capitol Projects Officer.
Not every drawing will be seen, only those selected.
"We still have to maintain a classroom in that space. We still have to provide instructional wall space, smart boards, bulletin board materials, where the class is still an active classroom," said Randall.
Other findings will be covered up by framework.
Whether you can see them through glass or hidden behind wood, the staff knows they're there.
"This is a treasure that doesn't happen to everyone, and it doesn't happen very often."
School officials predict costs will be less than that for the most recent findings on the 3rd floor.