Another difference that can be noted between right and left-wing think tanks concerns their media appearance and media relations. While in 1997 53 % of the U.S. media references made to think tanks involved conservative institutions, progressive think tanks accounted for only16 % of the media citations made to think tanks (32 % centrist institutions). This suggests that the media agenda is markedly influenced by conservative issues and ideology, and therefore leads to a considerable imbalance within the spectrum of political views.
On the other hand the financial resources of right- and left- wing media associated with think tanks also differ appreciably. While conservative foundations provided US$ 2,734,263 to four right-of-center magazines between 1990 and 1993 including The National Interest, The Public Interest, The New Criterion, and The American Spectator, over the same time period four left-of-center publications, namely The Nation, The Progressive, In These Times, and Mother Jones received only US$ 269,500 from foundations.
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American petroleum corporation that was founded in 1889 by the Standard Oil trust to direct the refining and marketing of oil in the Midwestern states. By the late 20th century, American operations still accounted for more than half of Amoco's total assets, though the company has been active in some 40 other countries in the areas of production, refining, and marketing. In addition to refining crude oil, Amoco is one of the largest producers of natural gas in the North American continent.