1.   Even official sources now accept that tall stacks tend to increase long-range transport of pollution.

2.   This arose partly from the ever present pressure from official sources to complete the survey of the country.

3.   While this booklet has become an official source of information, it is filled with misstatements of fact.

4.   Official sources later confirmed that these aircraft had immediately joined the air offensive against Iraq.

5.   Based on official sources, the whole story was later acknowledged by both Saudi and US military officials to be without foundation.

6.   Algerian official sources denied that he had met any opposition groups.

7.   According to official sources the decision was based on reduced tension in southern Africa and was unrelated to the incident in Moscow.

8.   Political imagery expressed in pictures, in elaborate ceremonial and in official narrative sources is the public face of government.

9.   Oral evidence, it will be found, is a useful counterbalance to more official sources.

10.   At home in Gloucester, her mother and father learnt of their daughters death not from official sources, but from a news bulletin.