1. Introduction  
2. Observations and Data Analysis  
2.1. VLA D-configuration Observations  
2.2. Data Reduction and Imaging  
2.3. Complementary Data  
3. Source Extraction  
4. Results  
4.1. Source Catalog  
4.2. Distances  
4.3. Physical Properties of the Ionized Regions  
5. Discussion  
5.1. Infrared Bubbles  
5.2. Association with Dust Emission  
5.3. Association with 6.7 GHz Methanol Masers  
5.4. Galactic Electron Temperature Gradient  
6. Summary