On Tue, Dec 8, 2009 at 10:16 AM, Karen Coyle <[log in to unmask]> wrote: > Couple of things: first, what we have at id.loc.gov is NOT LCSH, but a copy > of the LC subject authority file. The entries in this file form the basis > for subject headings, most of which add "facets" to the authority entry when > forming the subject heading. One could do a left-anchored match against > actual headings, and that might provide some interesting statistics. Yes, using the actual headings extracted from bibliographic data seems to be a better approach. It's easier to rank them, and as Karen points out you get the actual post-coordinated headings, not just the headings LC has decided to establish authority records for. //Ed