File:1970s student working in card catalog (8186611724).jpg
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![File:1970s student working in card catalog (8186611724).jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/7/76/1970s_student_working_in_card_catalog_%288186611724%29.jpg/601px-1970s_student_working_in_card_catalog_%288186611724%29.jpg?20170514203951)
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