As of 2009 the collection contains more than 2.8 million unique references (mostly to journal articles, conference papers and technical reports), clustered in about 1700 bibliographies, and consists of more than 4.4 Gb (950 Mb gzipped) of BibTeX entries.
As the Collection of Computer Science Bibliographies consists of many subcollections there is a substantial overlap (roughly 1/3).
The number of duplicates may be seen as an advantage, because there is a greater chance for finding a freely available full text PDF of a searched publication.
Publications are clustered by title and last names of authors, so it is possible to find an extended version (e.g. Technical Report or Thesis) of an article.
The collection was started in 1993 by Alf-Christian Achilles with a simple email-based interface and limited number of entries.