One such example is the collection and analysis of gray literature.

The objective was to provide access to European grey literature and to improve bibliographic coverage.

Instead members started to build institutional repositories or to provide access to electronic grey literature by other means.

The concept of grey literature has emerged since the 1970s.

Only in the second edition of his book, published in 1989, did he adopt the term "grey literature".

The table below shows the proportion of grey literature cited in publications from different scientific disciplines.

I'm really just a kind of curator, of the gray literature.

It is a particular specialist in the acquisition of "gray literature", difficult to obtain and not available via the standard book or journal trade.

The above service has been extended to edited books and grey literature.

The library also has a substantial collection of report material, much of it "grey" literature.