The Ogallala aquifer is a major source of drinking and irrigation water for America's central plains.

VOA: special.2011.07.08

This makes reefs an important source of food for millions of people around the world.

VOA: special.2010.08.10

The first involves sheep. Researchers have found that hair sheep are a good source of blood for use in tests to diagnose infectious diseases in people.

VOA: special.2009.08.03

His excuses became a continuing source of trouble for President Lincoln.

VOA: special.2009.09.03

And alfalfa can be a valuable food source for animals.

VOA: special.2010.02.09

Using non-performing rubber trees as a source of power also helps rejuvenate rubber production by making room for new planting.

VOA: standard.2009.09.13

The controversial transfer was endorsed this week by Madagascar's Constitutional Court which has become the source of legitimacy for the fledgling regime.

VOA: standard.2009.03.20

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

U.S.drug officials say Mexico is either the source or a transshipment route for most of the illegal drugs that enter the United States.

VOA: standard.2009.03.25

(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

Mangroves are the most readily available source of firewood for fires to boil seawater and what is called "salt dust" scraped from the soil.

VOA: standard.2010.03.29

(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

For many investors in Asia, gold's role as a source of safety and value has been reinforced over the past year of economic uncertainty.

VOA: standard.2010.07.21

The camp has become a source of tension among Calais residents and in France's relations with Britain, with London pushing for tighter border control.

VOA: standard.2009.09.22