In a previous post, Creating Real-Time Mini-People-Aggregators, I described a Healthcare-related use case of sourcing in license registries.
In the US, the majority of Healthcare professionals (except for some entry-level job holders) must be licensed to practice in the state where they do. License verification sites vary by state and profession, but you will often locate all Healthcare license types on one state-related site.
Sites that have license verification (link: License Lookups by State, or Google for them) dialogs wildly vary in search functionally they provide. On some, pressing the ENTER key leads to a display of everyone, ready to be