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CAD Blocks FREE! Download FREE CAD Blocks from a variety of categories and CAD disciplines. Browse before you download as all of our CAD Blocks have detailed thumnail views!

Find free downloads for supplier parts models, component models, 3D parametric models and supplier component downloads, including free CAD drawings, assembly models and full 3D CAD models. Use these free part models by dropping them directly into yo...

Be Communities is a social networking site for those in the architecture, engineering, construction, operations, and GIS communities with tools such as forums, blogs, a resource gallery, and a wiki for connecting, communicating, and learning from eac...

U.S. Geological Survey Coastal and Marince Geoscience Data System web site for finding USGS avaialble data.

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Products and solutions to reduce the strain on the environment and protect people from harmful particles, fibers, dust, gas, smoke and oil mist.

Practice into Knowledge: an interdisciplinary symposium at Teachers College, Columbia University, NYC

Providing researchers with access to millions of scientific documents from journals, books, series, protocols and reference works.

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