21.   This question can become a major source of friction.

22.   Tourism, which is a major source of income for the city, may be seriously affected.

23.   Fish was a major source of protein for the working man.

24.   Women of child-bearing age are at greatest risk, since their monthly bleeding is a major source of iron loss.

25.   As in the past, the recognition of Taiwanese sovereignty, actual or implicit, was a major source of conflict with the mainland.

26.   The regime of President Fidel Castro had lost a major source of economic and military aid with the collapse of the Soviet Union.

27.   The MQM was allegedly a major source of endemic ethnic violence in the province.

28.   A major source of opposition to the return of Rawlings to power was expected to come from the Nkrumahist parties.

29.   This measure encouraged the use of securitized debt as a major source of cooporate finance.

30.   These companies and others, such as the Sun Fire Office, through their accumulated resources became major sources of investment.