Abstract. This edition contains six databases including database on Russian "grey" literature, four address-reference directories, and reference-bibliographic database on ecology.

GREY – a local specialized database on Russian "grey" literature has been generated since 1989 according to the subject scope of the Russian National Public Library for Science and Technology. It currently includes over 41 500 records on pure and applied sciences, technology, economics, ecology, agriculture and medicine. Hardly accessible Russian domestic "grey" literature of limited circulation is a basic information source for the database. It covers books, preprints, conference proceedings, transactions of research institutes, scientific reports and the like. Each record contains bibliographic information, subject headings, abstract, UDC number, their English version and a transliteration of the required fields. Keywords for search are authors' names, subject headings, words from the title, words from abstract.