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Tree cover increased in Southeast Michigan over the past 30 years（图）
Tree cover increased Southeast Michigan over past 30 years
2020/8/14
The extent of both tree canopy and urban sprawl increased in Southeast Michigan between 1985 and 2015, according to a new University of Michigan study that used aerial photos and satellite i...
Monetary Policy During the Past 30 Years With Lessons for the Next 30 Years
Monetary Policy Lessons
2015/8/3
Considering the overall performance of the American economy,
the past 30 years divide naturally into two parts. During the first
part—roughly the first two-thirds—economic performance was quite
goo...
Change in macrophytic flora of Lake Takkobu, Kushiro, Japan, in past 30 years
aquatic macrophyte decline eutrophication
2009/4/1
The change in macrophytic flora in Lake Takkobu since the mid-1970s was briefly described. At that period floating-leaved plant communities dominated by species such as Nuphar pumila and Potamogeton n...