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Pacific Islander teacher erasing math from blackboard
TTM22B91_481

Pacific Islander teacher erasing math from blackbo...

Studio Shot of chalkboard
TTM13A21_407

Studio Shot of chalkboard

Close up of lavender and laboratory glassware, studio shot. Photo: Daniel Grill
TTM12A29_409

Close up of lavender and laboratory glassware, stu...

Close-up of chalk and blackboard eraser, studio shot. Photographe : Jamie Grill
TTM09A10_132

Close-up of chalk and blackboard eraser, studio sh...

Professor erasing formulae on blackboard.
TTM08A05_232

Professor erasing formulae on blackboard.