q=%E8%BF%91%E4%BB%A3&searchType=standard&isFacet=true&view=standard&searchWay=subject&rows=10&sortWay=score&sortOrder=desc&f_subject=研究&f_author=(德)约翰·冯·杜能(johann heinrich oun thunen)著&f_booktype=1&f_lang=chi&searchWay0=marc&q0=&logical0=ANDrows=10&searchWay0=marc&q0=&logical0=AND