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The web site autocad-3d.aec-data.com states the following, "AutoCAD - 3D models in DWG format." We noticed that the webpage also said " Select a letter, which begins brand." It also said " 3D models to download AEC-DATA. AEC-DATA - free download 3D models in formats DWG 3D. 19328 models, DWG 2D. 5112 models and DXF 3D. 3D models for software AutoCAD. New 3D models on AEC-DATA. Exner Expo laminated - glass. All new 3D models on AEC-DATA. Heating systems - fireplaces, stoves, radiators. Software for mass downloading multiple models. 442015 Updates 3D libraries Zehnder." The header had 3D objects as the highest ranking optimized keyword. This keyword is followed by 3D models, download, and free which isn't as urgent as 3D objects. The other words autocad-3d.aec-data.com used was 3D. cad is included but might not be viewed by web crawlers.