Implementation of Organizational IDs in NASA's ADS Abstract Service

After several years of effort, NASA's Astrophysics Data
System (ADS) Abstract Service (https://ui.adsabs.harvard.edu) has implemented
an affiliation component to literature searches in astronomy and physics.  
We use a two-tier heierarchy of institutional identifiers based on Ringgold
data and modified for our corpus of data.  We have tentatively identified
authors' institutions for approximately 95% of the 2.3 million astronomy
abstracts and approximately 70% of the 9.4 million physics abstracts.  
I will describe our journey, our current pit stop, and our final destination.