이정환 현공남 조덕래 2018-11-15T07:39:39Z 2018-11-15T07:39:39Z 1981-12 C1981-11-03 http://repository.krei.re.kr/handle/2018.oak/12978 농기계원가조사 : 농용트랙타 28마력 50마력(한국중공업) A research on the costs of agricultural machines : agricultural tractor with 28, 50 horsepower (Korea Heavy Industries) KREI 보고서 Lee, Junghwan Cho, Duckrae 9999-12-31 9999-12-31