The Portal to Texas HistoryFrom the website, “The Portal to Texas History is a gateway to rare, historical, and primary source materials from or about Texas. Created and maintained by the University of North Texas Libraries, the Portal leverages the power of hundreds of content partners across the state to provide a vibrant, growing collection of resources. In the Portal you may discover anything from an ancestor's picture to a rare historical map.” Scroll down from the search home page, click on “Explore by”, from there you can filter by collection, subject, dates, publication title and many more.