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1960s SCIENCE PROFESSOR WRITING A FORMULA FOR CHELATING AGENT ON CHALKBOARD
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1950s GIRL AT FRONT OF CLASSROOM USING POINTER TO READ THROUGH SCHOOL NEWS ON CHALKBOARD WITH TEACHER STANDING AT DESK
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1950s SCHOOL TEACHER WEARING GLASSES SITTING AT DESK IN FRONT OF BOARD IN CLASSROOM
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1940s SMILING SCHOOL TEACHER STANDING BEHIND HER DESK & IN FRONT OF THE BLACK BOARD WITH FRACTIONS
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Female teacher teaching a schoolgirl with other students sitting in the background
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Boy solving math problem on blackboard, looking at teacher for assistance
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Teacher helping boy draw angle on blackboard using protractor, rear view
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Teacher showing elementary student how to draw angle using protractor
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Portrait of a female teacher holding a chalk and standing in front of a blackboard
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1960s PROFILE OF SCIENTIST MAN IN LAB COAT WRITING OUT CHEMICAL FORMULA ON BLACKBOARD
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1940s SMILING MIDDLE AGED SCHOOL TEACHER AT DESK BESIDE GLOBE HOLDING RULER LOOKING AT CAMERA MATH ON BLACKBOARD
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1950s SCHOOL TEACHER STANDING IN FRONT OF BOARD LEANING ON CHAIR BY DESK
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Side profile of a female teacher teaching a schoolgirl on a blackboard
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1950s SCHOOL TEACHER AT DESK HAND TO GLASSES EXPRESSION OF SURPRISE OPENING A VALENTINE FOR TEACHER GLOBE BLACKBOARD
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Portrait of smiling male teacher with student in front of chalkboard writing
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Portrait of smiling male teacher and student in front of chalkboard holding hands
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