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정보화통계집, 2021.
정보화통계집, 2021.
한국과학기술정보통신부, 020.13059-한16저 | 과학기술정보통신부 | 2021 020.13059-한16저,
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(2020)국가정보화백서, 1-2
(2020)국가정보화백서, 1-2
한국정보화진흥원., 020.13-한16구-R | 한국정보사회진흥원 | 2021 020.13-한16구-R,
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Elementary & Secondary School Enrollment: Fall 1970-2008
US Department of Education [, ]