But Congress has put more into the budget of the national park system in the past three years.

VOA: special.2009.09.28

"We will use the tremendous capabilities of this ion propulsion system to climb out of orbit around Vesta, travel for almost another three years through the asteroid belt to dwarf planet Ceres and then go into orbit around Ceres and undertake the same kind of measurements there that we'll be doing at Vesta.

VOA: special.2011.07.27

that 'we tried initially, during the first three years of Gorbachev's tenure, to improve the system accelerate it but keep it intact.

VOA: standard.2009.11.03

There is an enormous risk we will continue to have another crisis in the financial system every three years.

FORBES: The New World Order Of Global Markets

The FAA said the voluntary reporting system for controllers has provided nearly 10 times the data during the past three years compared to the traditional reporting system.

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The release will mark the first major update of Microsoft's operating system since Windows 7 was released three years ago.

CNN: Final preview moves Windows 8 toward tablets