1. INTRODUCTION  
2. SCOPE OF DR9  
3.1. BOSS Main Survey Targets  
3.2. Differences between SDSS-I/II Spectra and SDSS-III BOSS Spectra  
3.3. Quantities Derived from Galaxy Spectra  
3.4. Changes in BOSS Spectrographs and Survey Strategy  
4. FIXED AND IMPROVED ASTROMETRY  
5. IMPROVEMENTS IN THE SEGUE STELLAR PARAMETER PIPELINE FOR DR9  
6. DATA DISTRIBUTION  
7. CONCLUSIONS