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Abstract
Free Internet resources that provide a significant amount of physical property information are critically reviewed. These free Web sites cannot totally replace classic print sources and online subscription databases. However, a number of these Web sites provide extensive and reliable property information, especially for substances that are used in commerce or have seen significant research interest. This guide will be of particular value to those with occasional needs for physical properties or working without the benefit of access to a major research library and its subscription-based electronic resources.