This paper presents a new area of research in library and information sciences - investigation into collection-level subject metadata that describes entire digital collections as integral wholes - and reports results of the multi-method exploratory study combining comparative content analysis of collection-level subject metadata in three large-scale aggregations of digital collections in the USA and Europe, transaction log analysis of user interactions with one of these portals, as well as interviews and observations of aggregation users.

This presentation discusses collection-level subject metadata in subject access to digital collections in aggregations. This was presented at the 18th International Conference "Libraries and Information Resources in the Modern World of Science, Culture, Education, and Business" in Sudak, Ukraine.