51.   Libra money is a major source of aggravation this week.

52.   Worldwide, on the other hand, it is a major source, especially of electricity.

53.   Although refrigerators are still a major source of minor injuries, they are no longer the lethal hazard they once were.

54.   Although tourism is also a major source of revenue and has the potential to be much bigger, Bhutan refuses to build up the industry.

55.   Although this will reduce a major source of income for the electronic communication networks, Ketchum said it would not drive them out of business.

56.   Analysts said the major source of the surge in the stock market Thursday was renewed optimism that the economy will grow moderately without inflation.

57.   And it has become a major source of black science graduates.

58.   And given that the growth in education costs continues to outstrip inflation, such tax-advantaged accounts may become a major source of school financing.

59.   And many of those states recently have been identified by law-enforcement officials as major sources for the guns used in crimes in other states.

60.   And merchandising, shareholding, and television rights are joining gate receipts and player sales as major sources of revenue.