The OHSUMED test collection is a set of
348,566 references from MEDLINE, the on-line medical
information database, consisting of titles and/or abstracts
from 270 medical journals over a five-year period
(1987-1991). The available fields are title, abstract, MeSH
indexing terms, author, source, and publication type. The
National Library of Medicine has agreed to make the MEDLINE
references in the test database available for
experimentation, restricted to the following conditions:
1. The data will not be used in any non-experimental
clinical, library, or other setting.
2. Any human users of the data will explicitly be told that
the data is incomplete and out-of-date.
(From the following source)