41.   Some stone was transported considerable distances, or was altered by heat, but most major sources were local and provided stone which was used in its natural state.

42.   The proposal by the company Shanks and McEwan to create a tip next to what is a major source of drinking water has encountered widespread opposition.

43.   The major sources of pollution were oil spills, discharges from refineries and natural seepage from oil-bearing strata.

44.   The fish of the Pantanal form a major source of food for the local population.

45.   The report also mentions poorly designed and inefficiently used dust yards as a major source of secondary emissions into the atmosphere.

46.   However, if badly designed, this can be a major source of stress at work.

47.   But viewers soon came to rely on Central South as their major source of regional news.

48.   Achieving that aim would have a profound effect on the energy industry -- coal and oil-fired power stations are major sources of CO -- and on forest management.

49.   International football, like the European club scene, is a major source of cash as well as prestige for the Scottish game.

50.   Not surprisingly, customer demands for lower charges and improved service were cited as the major source of competitive pressure in the industry.