
Caption
Young teacher writing equation on blackboard. Photo : Daniel Grill
Date
2011
Credit line
Photo12/Tetra Images
Reference
TTM11A14_193
Model release
Yes
License type
Royalty free
Available size
50,0Mb (1,1Mb) / 12,4in x 15,7in / 3717 x 4699 (300dpi)