21.   Greek companies have replaced Italian ones as the principal source of fuel, the intelligence reports show.

22.   His work made Fordham a principal source from which the thought of European philosophers and theologians like Karl Rahner, Joseph Marechal and Pierre Rousselot spread to North America.

23.   If those two rights were explicitly acknowledged, radical nationalists such as Karadzic and Plavsic would lose their principal source of appeal and quickly become irrelevant.

24.   If the summit is to be useful, it must address the three principal sources of the current chaos.

25.   In El Salvador, for instance, dollar remittances from Salvadorans in the United States are now the principal source of foreign exchange.

26.   In Guatemala and El Salvador, it is the principal source of currency.

27.   Initial tests suggest that a nearby aquifer is the principal source of the water.

28.   It is a place where subway vendors hawk cases of Pringles to a population whose principal source of protein is real potatoes, lifted fresh from the ground.

29.   Meigher said the on-line service had not yet begun to produce revenue, adding that the magazines would probably remain the principal source of revenue for the company.

30.   Since NASA provided timely and useful information on the Mir it soon emerged as a principal source of information.