TY - GEN AU - 이정환 PY - 1981/12 UR - http://repository.krei.re.kr/handle/2018.oak/12978 TI - 농기계원가조사 : 농용트랙타 28마력 50마력(한국중공업) TT - A research on the costs of agricultural machines : agricultural tractor with 28, 50 horsepower (Korea Heavy Industries) TA - Lee, Junghwan TA - Cho, Duckrae ER -