The Iraq Body Count organisation, which cross references reported deaths with official figures, says 4, 571 civilians were killed in 2012, bringing the number of civilian deaths since March 2003 to between 112, 017 and 122, 438.

BBC: Iraq 10 years on: In numbers

"What I find difficult are all the cross-references and exceptions, " says Mr. McConnell, now a professor at Stanford Law School.

WSJ: Here's a Funny Idea: Medicare Laws That Are Easy to Read

Into this mass of data the producers have injected cross-references and geo-tags, films and sound clips, archival photographs and rare historical maps.

ECONOMIST: A multimedia compendium of 2,000 years

Another year later, the government conducted additional searches and informed nine of the plaintiffs that it had located responsive documents containing cross-references to them.

FORBES: Connect

Throughout, he includes fascinating, little-known tidbits relating to the law or lawgiver, and he provides cross-references to other laws or equations mentioned in the book.

FORBES: The Weekly E-Reading List

Cross-references to the genealogy of the many Scottish clan chiefs who do not have hereditary titles and who have frequently married into the Scottish and English titled aristocracy are also absent.

ECONOMIST: M��lords, ladies and gentlemen

Shippers enter their product and destination data on the Open Harbor interface, which then cross-references the information against an 8-million-line Oracle database, updated daily, of export rules, documents and taxes for 64 countries.

FORBES: Customs Solution

Wired.com reported in August that Griffith created an application called WikiScanner that tracks edits that have been made to Wikipedia articles and cross-references them against IP addresses, which can be traced back to companies' offices.

CNN: Use with caution: The perils of Wikipedia