Road maps, produced by the millions, are compiled from road surveys, topographic maps, and aerial photography.
ROBERT PEAR CHART: Adding Up the $787 Billion Tab: Numbers are compiled from estimates by House and Senate committees and the Congressional Budget Office.
DAVID M. HERSZENHORN CHART: Adding Up the $787 Billion Tab: Numbers are compiled from estimates by House and Senate committees and the Congressional Budget Office.
The rankings are compiled from the most recent figures available – official 2007-08 returns from universities and higher education colleges to the Higher Education Statistics Agency (Hesa).
JOHN M. BRODER CHART: Adding Up the $787 Billion Tab: Numbers are compiled from estimates by House and Senate committees and the Congressional Budget Office.
JASON DePARLE CHART: Adding Up the $787 Billion Tab: Numbers are compiled from estimates by House and Senate committees and the Congressional Budget Office.
MICHAEL COOPER CHART: Adding Up the $787 Billion Tab: Numbers are compiled from estimates by House and Senate committees and the Congressional Budget Office.
KENNETH CHANG CHART: Adding Up the $787 Billion Tab: Numbers are compiled from estimates by House and Senate committees and the Congressional Budget Office.
Metascores are compiled from a highly select group of (mostly American) sources such as daily newspapers, weekly magazines and prominent websites.
Backgrounds are drawn from appropriate outline maps of provinces, countries, or regions of the world, while overlaying subject matters are compiled from specialized sources of information.
In most cases, modern maps are compiled from photographic observations made either with Earth-based equipment or with instruments carried aboard spacecraft.
