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1960s SCIENCE PROFESSOR WRITING A FORMULA FOR CHELATING AGENT ON CHALKBOARD
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A group of children, boys and girls in a classroom with their teacher.
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1960s MAN TEACHER AT DESK IN CLASSROOM PENCIL PAPER IN FRONT BLACKBOARD BACKGROUND SMILING AT CAMERA
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1960s MAN STUDENT TEACHER POINT AT GLOBE AT DESK NOTEBOOK BOOK PAPERS WEAR SUIT & TIE CHALKBOARD STUDY HISTORY GEOGRAPHY
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1960s ANGLED BACK VIEW OF CLASSROOM WITH TEACHER AT BLACKBOARD PLOTTING COMPLEX EQUATION IN GRAPH FORM
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1960s SMILING MALE SCHOOL TEACHER SITTING AT DESK WEARING EYEGLASSES LOOKING AT CAMERA
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1960s BACK VIEW OF CLASSROOM WITH TEACHER STANDING BEHIND DESK WITH BOOK IN HAND EXPLAINING GRAPHED EQUATION ON BLACKBOARD
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Portrait of smiling male teacher and student in front of chalkboard holding hands
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Myanmar, Chin State, Kempetlet. Teacher and pupils Inside a local primary school (MR) (PR)
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1960s SIDE VIEW OF GRADE SCHOOL BOY AT DESK WRITING WITH TEACHER WRITING ON BLACKBOARD IN SOFT FOCUS IN BACKGROUND
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Portrait of a female teacher standing with her students in a classroom
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1960s PROFILE OF SCIENTIST MAN IN LAB COAT WRITING OUT CHEMICAL FORMULA ON BLACKBOARD
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1960s TEACHER AT BLACKBOARD WITH MALE & FEMALE STUDENT EXPLAINING MATH PROBLEM
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