These digital collections from the Lehigh University Digital Library cover a wide range of subjects, mostly related to the past and present of America's Rust Belt. For example, Beyond Steel: An Archive of Lehigh Valley Industry and Culture elucidates the industrial boom and bust cycle that took place around Allentown, Pennsylvania in the late 19th through the early 20th centuries. Here readers will find an excellent Introduction, as well as sections on Business & Technology, Society & Culture, and Community Services, among others. Articles by librarians and historians contextualize the primary materials, such as photographs and company documents. Other equally developed collections on the site include Lehigh Valley Geology, Illuminated Manuscripts, The Problem of the Planets, and a number of others.