Their material dates back to the early 80s, even before. Set fee allows unlimited searching and article downloading. This is a combination spider search of web pages and a special collections database with articles from publications. More than 100 U.S. papers. 221 unique files that don't appear anywhere else.
Data can be output in variety of formats, including spreadsheets.
Adds 4.6-million documents a week. This first-ever study describes the nature of the deep Web, and quantifies its size, importance and quality. Major sections deal with study methodology, findings, and implications. The paper has been written according to peer-reviewable standards. It contains 7 figures and 10 tables, with complete references and citations.