Topics
Every topic in the collection. Two topics are joined when they appear on the same publication, and the line thickens the more often that happens. Node size is how many publications use the topic, on the same scale the tag cloud used.
Hover or tab to a topic to list what uses it and reveal its neighbours. Click to pin. Drag to rearrange, scroll to zoom. Topics used by a single publication are unlabelled until you hover them.
Hover a topic to list the publications that use it.