1. INTRODUCTION
   1.1. Metallicity Gradients
   1.2. Thick Disk Formation

2. DATA
   2.1. Sample Selection
   2.2. SEGUE Stellar Parameter Pipeline: Accuracy in Regions of High Extinction

3. DISTANCES

4. CORRECTING FOR SELECTION BIASES: WEIGHTS

5. RESULTS: RADIAL METALLICITY GRADIENTS

6. ERRORS
   6.1. Metallicity Bias

7. DISCUSSION
   7.1. Comparison with Previous Studies
   7.2. Comparison with Open Clusters and Cepheids
   7.3. Implications for Thick Disk Formation

8. SUMMARY