%0 Journal Article %T ReflectionsonTwentyYears'Experience %J µØÖÊѧ±¨ %P 21-47 %D 1942 %X WhenIwascalledtodeliveranaddresstothiscommemorablegatheringImadesomeeffort,following,theusualpractice,inthechoiceofasuitablesubject.Before,however,IcouldsettledownseriouslyongeologicalproblemsIfounditdifficulttoresistcertaindistractionsthatarisefromthedevelopmentofscientific. %U http://www.geojournals.cn/dzxb/ch/reader/view_abstract.aspx?file_no=1942Z102&flag=1