![](http://www.alamy.com/thumbs/6/6B1CC0B3-C2EB-469F-85F9-C2D3E29EB6D2/JAEY5T.jpg)
blackboards,black board,isolated
Size: 5184px × 3456px
Photo credit: © Marina Lohrbach / Alamy / Afripics
License: Royalty Free
Model Released: No
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