Six more paper references have been added to the “Integrating GIS with Models: A Bibliography” page:

• Efficient Noise Mapping using ArcGIS and detailed Noise Propagation Simulation
• Simple GIS Tools for Traffic and Transit Noise Studies
• A GIS-Based Approach for 3D Noise Modelling Using 3D City Models
• Integrating NOISEMAP with the Geographic Resource Analysis Support System (GRASS) to enhance environmental impact assessments and land use compatibility studies
• Environmental noise contouring in the 21st century
• Integration of the Traffic Noise Model with ArcView GIS