Researchers and historians may be particularly fond of the Canadian National Digital Heritage Index (CNDHI), a catalog of media from Canada's university and library systems. Sponsored by Library and Archives Canada and the Canadian Research Knowledge Network, the resource includes more than 1,500 materials from a range of sources (such as provincial and territorial libraries, universities, and archives). The collection might feel overwhelming at first, but the site's easy-to-use search filters allow users to sift and sort. For example, results can be narrowed by media type (e.g. publication or manuscript), language (English or French), keyword, or collection. When browsing the materials, visitors will notice that items are tagged with keywords (e.g. "education" or "transportation") and list a brief synopsis. See a material of interest? Click the "Details" button in the lower right corner of that item's search listing to pull up its CNDHI record and a collection URL (where the item is housed). Additions to CNDHI are ongoing, and visitors can suggest additions to the compilation of resources via the "new collection form" link at the top of the site. Prior to doing so, you may want to read the FAQ section (also linked at the top of the site) to ensure the suggested material complies with collection criteria.