Mr. Bahtiarian says the main source of noise pollution is the propeller.

VOA: special.2011.06.29

He says Afghan and international officials must tackle both the source and the consequences of the nation's drug problem.

VOA: standard.2010.06.23

U.S.Treasury Secretary Timothy Geithner says China has taken steps to modify a controversial policy that was a source of growing concern among U.S.

VOA: standard.2010.05.25

Holbrooke says the long-held notion that Afghanistan's illicit opium trade is the main source of funding for the insurgency is simply not true.

VOA: standard.2009.06.15

(Speaking) Institute director Eric Leonhardt says he's had his eye on the dairy herd as a source of transportation fuel for a long time.

VOA: standard.2010.02.23

(Speech) He says that today, the propaganda of arrogant nations of the world is the main source for the existence of conflict inside Iran.

VOA: standard.2009.12.07