mu cao da tian lun zuo zhi de li lun yu ji shu 牧草大田轮作制的理论与技术 nong ye bu guo ying nong chang guan li ju 农业部国营农场管理局 creator text book zhong yang ren ming zheng fu nong ye bu 中央人民政府农业部 1952 1952
print
CHI Agriculture https://www.biodiversitylibrary.org/bibliography/53178