World War I sets remained popular for many years after the war ended. In the United States, the most commonly encountered World War I stereographs were produced by four principal companies: Keystone, Underwood & Underwood, and W. E. Troutman of this country, and Realistic Travels of England. Other English-language stereograph sets were produced by Underwood & Underwood's English subsidiary and by Rose Stereoviews of Australia. Another English company, Nightingale, made battlefield scenes taken a year or so after the war. Of all the producing nations, the French not surprisingly appear to have been the most prolific, with several major companies mass-producing both glass and paper stereographs. One major German company, Neue Photographische Gesellschaft (NPG), manufactured a variety of views for Germany and Austria-Hungary. While Keystone views are the most common in this country, not all Keystone cards are common. Indeed some views are quite scarce, particularly in very fine condition.

Keystone was the largest and most long-lived producer, making extensive purchases from Underwood & Underwood and European companies. The company was the subject of a book, The Great War Through Keystone Stereographs, by Robert S. Boyd, and is available through amazon.com. World War-related celebrations and memorials continued to be staples of Keystone stereograph sets for years after the war, but the book is concerned only with those sets about the war itself. Individual chapters describe the development of Keystone's World War sets in more detail than this web site.