1. 대한민국의 기술사
네이버 검색https://search.naver.com/search.naver?sm=tab_hty.top&where=nexearch&ssc=tab.nx.all&query=%EC%9D%B4%EC%A2%85%EB%82%A8%EA%B8%B0%EC%88%A0%EC%82%AC&oquery=%EC%9D%B4%EC%A2%85%EB%82%A8%EA%B8%B0%EC%88%A0%EC%82%AC&tqi=iw9fPwqo1fsssLQrjXhssssssa0-365237
다음 검색https://search.daum.net/search?nil_suggest=btn&w=tot&DA=SBC&q=%EC%9D%B4%EC%A2%85%EB%82%A8%EA%B8%B0%EC%88%A0%EC%82%AC