Who can answer this?
Keywords: Woman, Women, Lectures, Teachers, Teaching, Children, Students, Pupils, Kids, Boys, Girls, Blackboards, Professors, Instructors, Pointing, Points, Pointers, People, Speakers, Speaking, Talkers, Talking, Orates, Orating, Orators, Presenters, Presenting, Workers, Working, Classrooms, Schools, Education, Learning, Instructing, Instruction, Careers, Trades, Desks, Retro, Clip, Art, Clipart, Vintage, 1940's, 1950's, '40s, '50s, Forties, Fifties, Vintage, Classic, Advertising, Graphics, Drawings, Scalable, Vector, EPS