Sentence examples for principal sources from inspiring English sources

Those three countries are principal sources of Iran's trade.

Among these are hematite, magnetite, limonite, and siderite, which are the principal sources of iron; chalcopyrite, bornite, and chalcocite, the principal sources of copper; and sphalerite and galena, the principal sources, respectively, of zinc and lead.

A gaming tax and the sales tax are the principal sources of state income.

Commerce, agriculture, and livestock raising are the principal sources of income.

Evidence that coal was derived from plants comes from three principal sources.

Eclipsing binaries are the principal sources of information on the masses and radii of stars.

A densely populated, fertile region, it constitutes one of the principal sources of Turkish tobacco.

Agriculture, livestock, and food processing are the principal sources of income, and there is some light manufacturing.

The Scriptures and the Fathers notably Augustine, who is quoted more than 1,000 times are its principal sources.

Hydroelectric power and coal are the principal sources of energy in Serbia, which has no nuclear power stations.

The principal sources of imports are the United States, Japan, Germany, Italy, the United Kingdom, and Taiwan.