3 images for chalkboard formula vintage professor

  • 1960s SCIENCE PROFESSOR WRITING A FORMULA FOR CHELATING AGENT ON CHALKBOARD Stock Photo - Rights-Managed, Code: 846-05647177

    846-05647177

    1960s SCIENCE PROFESSOR WRITING A FORMULA FOR CHELATING AGENT ON CHALKBOARD

    Rights-Managed

  • 1930s 1940s MAN TEACHER PROFESSOR LOOKING AT CAMERA WITH POINTER AT BLACKBOARD Stock Photo - Rights-Managed, Code: 846-02797123

    846-02797123

    1930s 1940s MAN TEACHER PROFESSOR LOOKING AT CAMERA WITH POINTER AT BLACKBOARD

    Rights-Managed

  • 1940s 2 STUDENTS PROFESSORS MATHEMATICIANS BLACKBOARD STUDYING COMPLEX EQUATIONS Stock Photo - Rights-Managed, Code: 846-05648345

    846-05648345

    1940s 2 STUDENTS PROFESSORS MATHEMATICIANS BLACKBOARD STUDYING COMPLEX EQUATIONS

    Rights-Managed